Chevy dual tank problems. Gauge combines level info from both tanks.

Chevy dual tank problems However, like any other car part, they can experience issues from time to time. Still kinda kicking myself over that. Monroe Pickup Bed, Rear Air Ride w/ dual height control, Rear Sway Bar, Front Track Bar, Fass Lift Pump, EFI Live, Kings Shocks, EGR block off plate, PCV reroute, 2007 Intercooler Chevy Forums FREE technical assistance for your restoration and repair. I have 3 lines on each sending unit. 2 fuel tanks with 2 fuel pumps. Joined Feb 5, 2014 Posts 4,428 Reaction score 3,578 Location Kentucky First Name David Truck Year 1986 Truck Model K10/LM7 5. * Highest reading is 90 ohms = full tank. 1985 Chevy C20 RCLB 350 4 Bolt, 4 Barrel Carb, 4. The rear tank looks easy to pull out, and in truth it is, except for the fuel fittings that attach to the pump in a spot where no human hands can reach. Admin 76 C10 Dual Tank Questions The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In To I've had some issues with my 84 dual tank, and this thread gives me a lot of insight. I don't have a right hand filler door, nor do I want to swap beds/bedside or cut a hole in this bedside, and I can't have a filler inside the bed, so I'm trying to think of ways to fill a passenger side tank from the drivers side tank. Conversely, what little is to the right of the orange line is what single tank trucks have. . Tank 1 stays full until tank 2 is empty. Good afternoon, Before I get spammed saying "you coulda searched this thread" and vice versa, I have looked into the forum but have a strange problem unlike others are having. 0 Liter Gas 2004 chevy 3500 truck dual tank. Have installed new surface mounted fuel pump on rear tank, new "in-tank" fuel In 1981 (I think) they switched and made the driver’s side tank the main tank, and single tank trucks had only a driver’s side tank. I need to mount underbody boxes and the front filler hose is in the way. I still had problems switching tanks. One known trigger is simply fueling the truck with the A friend has a problem with his R10 1987 TBI his truck has stopped and runs it and doesn't want to start, put a little gas in the trottle body looking to start so there seems to be a problem with the current somwhere because we no longer hear the two pumps (dual tank) or the click of the relay, check all the ground everything seems ok, the switch selector tank separator GM has issued a product recall for certain examples of 2017, 2018, and 2019 GMC Sierra HD pickup trucks, including both 2500 HD and 3500 HD models, due to a problem involving the dual fuel tanks It was ordered with the dual fuel tank option. Stock 6 port valve is ok in LS service. zif you do hear it sounding the switch your tank unit for that one tank you try to switch to is a fault. This is a list of what steps I took. Author Topic: 1986 K10 Canister/Dual Fuel Tank Question (Read 12849 times) soccer8yanks. 6 Technical. Ase Master Certified, GM Master 82 c10 dual fuel tank issues. Register or Log In To remove these advertisements. I did not want to drop the tank so I spliced in rubber gas hosing but needed to My brother has the twin to my truck he has an 2001 suburban 6. com: I've got the same problems most people have with these, gauge at 3 o'clock, etc. Dual tank '87 TBI - how to wire pumps (Topic#282639) cloudmaster Senior Member Posts: 1019 capable of lots of trouble stock Email Report cloudmaster Senior Member Posts: 1019 Loc: Arrowsmith, IL Reg: 01 I'm kinda poking at installing dual tanks in my '83 swb. I first put back in the sending unit on top of the engine. Dual Tank Switching Methods by Years GM used at least three different tank switching Common Issues with Chevy Dual Tanks. The rear tank isn’t transferring fuel. Problem is: I would like a wiring diagram and a fuel line diagram If possible. So its the old school selector valve from the original one ton. Thanks, guys _____ 1970 long fleet, 355 4 speed, primer, walnut goodies I have a 2011 Chevy 3500 chassis cab / flatbed with dual tanks. Well, that guy said all the under-hood stuff was fine to stay. My new bed has About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright PROBLEM: Fuel gauge quit working light came on and stayed on empty and transfer pump of course did not work. Customer: I have a 2015 cab and chassis 3500 duramax with dual tanks. Then, whenever the selected tank gets near empty, the Whats the tanks issue? I have dual saddle tanks on my 78. Newbie; Posts: 5; That being said I have two separate problems. A year ago I had a small leak in the driver side rubber tank hose. I feel like others have had this designed as people with dual in tanks I could see having this problem. When I switch When I overhauled my entire dual tank system I had a multitude of problems: 1) Aux tank sending unit had torn up screen letting all sorts of scaly crap in 2) LH to RH main fuel We have a 1 ton cab & chassis (Duramax diesel) with dual tanks and fuel gauge quit and will only pull out of 1 fuel tank, anyone ever have this problem or know where to check? It happen when you fill the back tank when the front tank is empty. Regardless, I'd 'bably use a 6-port valve. They're the same as Suburbans and Tahoes through multiple years. It’s happened before, I would clear the code (p2636) prime back up , go again. S. You only need one wire to the tank on each side and one wire to the valve for the 1973-1980 dual tank systems. It had the "Mr. 73-87 Chevy Truck Dual Tank Wiring. 1986 silverado dual fuel tank system The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board 1986 silverado dual fuel tank system Web 67-72chevytrucks. Newbie; 1983 Chevrolet K10 - Built 350 (Winter Toy) 1992 Chevrolet Lumina Euro (Sold @ 265,000 miles) 2003 Ford Escape 4x4 - Mac Perf. I currently don't use the external fuel tank but if I go a long distance I might since diesel here is currently $2. On some trucks that is a very long wire, and it does not run directly from the switch to the gauge. I even have a new valve for the dual tanks. 5L, NV4500 2005 Chevy Silverado LS 2500HD 6. Mike S Discussion starter. Has 67k miles and was taken very good care of by previous owner. Seems my manual states there is a porportioning valve somewhere that controls the "flip" from one tank to another. reformulated gas in our area for about 2 weeks and I Customer: I have a 1999 chevy c-3500 5. I either need to re route it or just cap off the front tank filler and use only the rear tank. ‘05 lly dual tank problems. Gas gauge will not work. Then switch back to right tank to exploit the return fuel until engine sputters again. 73-87 Chevy _ GMC Trucks » Engine/Drivetrain » 1986 K10 Canister/Dual Fuel Tank Question « previous next » Print; Pages: [1] Go Down. 73-75 manual valve and dash mounted gauge switch and valve plunger. 0 2500. I can't get my transfer pump to work. 84GMCSierra. Its run that way so that its easy to add a 2nd tank to a single tank truck. All engine fuel is pulled from the side tank. goes all the way to right and then returns to zero. It has dual fuel tanks. Answered by michael in 12 mins 16 years ago. The low pressure, about 32 kPa (7 psi) fuel balance pump is used only to transfer fuel from the auxiliary tank to the main tank in order to balance the fuel levels in both tanks. This was in my old '74 K10 with dual tanks. Went ahead and changed front tank sending unit($125) still not working. :grin2: TSB's are advisories designed to tell techs what the cause is for certain problems and the likely fix, not a recall unless they specifically say they are. Even when i change it from side to side. Chevy Non stop problems with our older dual tank duramax trucks. Owner had removed pass side tank and solenoid valve when we got it. Checked fuses cause I was getting no voltage to the sending unit. It automatically draws from both tanks, no switch to change from one tank to the other. I don't think there is any driver over ride for the system -- This LSx spec'd dual tank kit is going out tonight for a member in NM! I needed to finish drafting his harness diagram schematic for future troubleshooting and/or mods. Mike Currently 1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig). 2003 Chevrolet 2500HD CC: 2011 Chevrolet 3500HD CC 4X4 and 2013 3500HD ex. Switch to left tank until gauge shows about 1/3 full. A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. 0L TBI 700R4 Dual Tank 1987 TBI Fuel Gauge Issue - Please Help. 05 6500 fuel tank issues need help! Jump to Latest My company recently purchased it with no problems. 0. It is a dual Tank system. 29 yrs. Has to have old gas in it. One big tank under driver side and another tank above spare tire. The tank was removed and the float was reset, and that solved my problem. 7tbi 400th 208 4. I will drop the pass tank and flush out before using. Dukester68; Jan 8, 2025; Gauge, Speedo & Instrumentation; Replies 9 Views 619. Send Private Topic View Profile. In the end its best to use the baffle tank . It didn't matter to me operationally, though, as I switched tanks every time I got gas. There is a connection on the firewall near the accel. The low pressure (about 32 kPa or 7 psi) fuel balance pump is used only to transfer fuel from the auxiliary tank to the main tank in order to balance the fuel levels in both tanks. Try a little later and it starts. The engine draws from the front tank. Chevy 04. Mechanic's Assistant: Is the power loss consistent, or does it fluctuate? Customer: consistent Mechanic's Assistant: What is the model of your '87 Chevy? Customer: Silverado 1/2 ton 4wd pickup Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far? Customer: yes Mechanic's I have an 87 chevy V20 silverado with dual tanks running a modified TBI set up. I looked in my 78 shop manual and the wiring colors, etc are different in mine. What's new. Replaced bad fuel pump in front tank. What is my best plans of fixing the problem . Just need to be careful wiring it up. and some of the schemes are very complicated because it made it easier 73-87 Chevy _ GMC Trucks » (1978) but I haven't had any problems out of a dual tank setup so i never messed with one beyond changing out the valve itself. Basically you have a primary and a secondary fuel tank. "Check your ground wires?" That has to be the biggest cop out ever on electrical problems, especially when the OP posts "I did this and then that happened. Dual tank fuel gauge issue Thread starter 05chevy; Start date Nov 9, 2015; Forums. Intake/Exhaust (Wifes' DD) dual tank days are gonemy new silverado work truck has a 32 or 34 gallon tank ($100 + for a fillup)and goes over 500 miles on a tank. Hey. Rear tank has been removed due to rusted out fuel lines. If you own a 73-87 Chevy truck with dual fuel tanks, it’s important to have the wiring properly set up to ensure proper functioning of your fuel system. When I overhauled my entire dual tank system I had a multitude of problems: 1) Aux tank sending unit had torn up screen letting all sorts of scaly crap in 2) LH to RH main fuel supply crossover line was FULL of muddy/rusty debris and was 95% blocked! 3) Float arm contacts worn bad on both sending units I went ahead and installed all new fuel 1999 chevy 3500hd 7. the gauge is always on E. Put tank back in and new valve in. Save Share Reply Quote Like. Both tanks have been working So, as the fuel is pulled from tank 1 the vacuum will pull the fuel from tank 2. Stroked suggests - the first step in the trouble shooting process is check the ground connection at the buss The main issue I've been having is a fuel delivery problem, which I think I've solved with a new fuel pump. I have had Worst 2016 Chevrolet Silverado 3500 Problems #1: Chipping, Scratching 2016 Silverado 3500 Average Cost to Fix: N/A Average Mileage: 1,000 mi. Newbie; Posts: 14; Newbie; 2004 chevy 3500 truck dual tank. Will keep you from having to replace tanks or alter the existing plumbing. The check engine light does not go off until I clear the General Motors is recalling an estimated 18,547 2016 to 2018 Chevrolet Silverado 3500 and GMC Sierra 3500 trucks equipped with gasoline engines and dual fuel tanks for a possible defect involving a sensor. Customer: I have a 2004 Chevy 3500 diesel with dual tanks, the fuel gauge went to empty and the transfer pump stopped at the same time, checked fuses with no luck. I wiring scheme for a stock dual tank setup is as follows: On the fuel tank selector valve: Pink/Black = Right Tank Sending Unit. My truck has dual tanks with a switch on the dash to toggle between them. 15 years GM master tech. Again am wanting to have the FASS overflow going back into the correct tank. Unable to get gas gauge to work. Pulled fuel filter off and empty. This works great as long as the tank 1 cap is sealed, which mine has an o-ring. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon Note: Cab and Chassis models have two tanks- when the front tank is low, the system senses that, and turns on a transfer pump. It is VERY complicated. 03 Duramax fuel guage/pump issue (dual tank truck) For a couple monthes, I haven't been able to get fuel from the. General Motors LLC (GM) is recalling certain 2011-2015 Chevrolet New 2018 3500 dual fuel tank issues. the issue may be with the fuel tank itself. 81 The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In To remove these The early style is prone to failure, momentary are not. The main fuel balance pump supplies fuel to the fuel injection unit. 4 Radio, 225/70R19. ( front tank empty - rear tank full ) Last. If you fill '96 dual fuel tank issue. Three port Supply-only, Six port Supply and Return. Hint: It's ONE wire. 73-87 Chevy _ GMC Trucks » Fuel Systems and Drivability » Newbie with Fuel Pump and Gauge issue 1987 R10 dual tanks « previous next » Print; Pages: [1] Go Down. Where do you live? I am about to take everything dual tank related off of my truck to install a single rear mount tank. 2004 chevy cab/chassis, 4wd, diesel, rear fuel tank. Thanks. Not certain on the 4500 Kodiak trucks. On my 2013 the rear tank holds 40 gallons, the front 23. Over 20 years of bumper to bumper GM experience. So what you actually see is the average between both tanks. You could check the fuel pump and the existing fuel tank to see if they are plumped with a return line. cab 4X4- try this if your fuel tanks not switching This video shows the basic layout and operation of the dual tank switch valve. From the dealer: Spoiler: List of compatible trucks. Here's my issue: I have filled both tanks and regardless of which one is selected, the fuel gauge will only read about 2/5 full when the tank is completely full. Wednesday at 6:55 AM. I see 2 tanks underneath. electrical, a/c, susspension, brakes, electronic steering Customer: 03 Duramax fuel guage/pump issue (dual tank truck) For a couple monthes, I haven't been able to get fuel from the front tank. 73-80 Electric solenoid valve with single wire actuation. Super Mechanic. By the way this is a 2004 chevy cab and chassis w/dual tanks. This is how the 2500/3500 dual fuel tanks operate-- fuel is transfered from the rear tank to the front/side tank. into the main, and did not switch. I realized while I was under the truck that I have dual fuel tanks. I get no trouble codes, the rear pump has no power, wiring & lines are good, front pump has power. 3 Cummins--SOLD 1957 GMC 1 ton flatbed 03 chevy silverado 3500 w/ dual tanks. On my truck it runs from the switch, through the firewall and to the gas tank, and then back from the gas tank to the gauge. I finally called Chevrolet, they informed me of a problem with the float placement in the tank. I am slowly going throughout he truck and fixing what seems to be broken or not functioning properly. The gas gauge wont read. On my trucks that have dual tanks, 1/4 on the gauge equates to a low rear and '79 dual tank wiring diagram The 1973 Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board '79 dual tank wiring diagram Web 67-72chevytrucks. Most original owners were notified, and My left tank works and as soon as you flip it to the right tank the truck dies. Reads both Hey all, after blowing up my transfer case due to pump rub and subsequently running dry. The engine died as soon as I switched over to the right tank so I switched it back to the left and the truck re-started. 3L Vortec V8 A/T 4WD Base Crew Cab Pickup Fleetside 2004, 2005 SOURCE: 1982 chevy truck with dual gas tanks with guage or tank problems. While its running you can pull the relay and the engine stays running. Gasket 12S Micro Electric Fuel Pump" installed when I bought it, but was leaking slightly from thread insert for the filter. Chevy Forums FREE technical assistance for your restoration and repair. Apparently you have not had too many chevys, everyone I had in the 70's and 80's had a switch on the dash for tank selection. The 2017-2019 Chevrolet Silverado 2500, 3500, and GMC Sierra 2500 and 3500 rear fuel tanks may collapse. This time I can’t get any fuel to the filter, I can hear pump running, no fuel and no pressure Mechanic's Assistant: Have you noticed an increase in fuel consumption? How do I keep dual tanks when doing a ls swap. It has factory dual tanks and electric fuel pump mounted on the passenger side frame rail just forward of the tank selector valve. Plenty of dual tank valves to be found in junk yards or you can use a manual brass valve . On last trip ( tanks full) drove 250 miles and truck died at 75mph. I want to remove the rear tank. This module is located by the front (main) lift pump. When you fill only the front it usually reads 1/2 full, when both tanks are fll it Reads fullas long as the front tank is full it's supposed to use the rear tank firstwell it's still reading full when both are full and half when the I have a 2007 GMC C5500 duramax with dual fuel tanks. I am currently running this setup right now with no issues. Intake/Exhaust (Wifes' DD) 2007 Mercury Milan - Steeda Tuned (Summer Toy) 1973-1991 Dual fuel tank systems theory of operation 25 posts Jan 5, 2018 wiring for dual tanks - The 1947 - 67-72 Chevy Trucks 9 posts Feb 2, 2016 bad fuel delivery 77 c20 dual tanks - 67-72 Chevy Trucks 19 posts May 12, 2019 Explain dual tank operation - The 1947 - 67-72 Chevy 11 posts Jan 3, 2016 More results from 67-72chevytrucks. Re: Wiring schematic for gas actuator/switch dual tank 08-17-04 04:29 PM - Post# 497624 In response to Mangus I had the same issue but it's been a year or so ago and I didn't write down the color code nor do I remember but if there are 5 wires in that plug, then one goes to the gas guage, one to the left tank sender and one to the right tank sender. goodwrench9124. cable for the valve (two wires) that needed to be GM has a bulletin out for that issue. Question about fuel line routing on an 82 K10 with dual tanks. 05chevy Active member. My truck is a 2001 Chevy Suburban 2500 6. Even though you're not doing an LS the fuel system requirements are similar. I used a Tee and now have the sending unit back in the system and the mechanical oil gauge next to it. Got it towed home. , ASE master, cert. Discussion in '1973-1987' started by jacob0204, over the open hose to prevent those pesky mud dauber wasps from building a nest in it and causing you weird running problems . It has dual tanks. Dual Fuel Tank Line Kit For Gm Ls Series Engines. 6 showed fuel level low , just fueled up both tanks, then a few minutes later, I run out of fuel. On kits which significantly deviate from stock I design and include a color coded diagram using my graphics program-another benefit you don't get from the big harness companies! On vehicles with dual tanks, the front tank is the main and the rear tank is the auxiliary. " '69 Chevy C-10, swapped 307 V8, TH-400 Sold too cheap '09 Chevy 2500 Suburban Gauge combines level info from both tanks. We are having a lot of problems with diagnosing his starting and running problem, he has already replaced the fuel pump in the main tank twice, yesterday was the first time for me crawling under there and realized he has two gas tanks I've never seen that before on our trucks so here's my The ECU turns on the transfer pump when the fuel level of the rear tank is higher than the front tank. Went to fill up with fuel and the rear tank Dual tanks not switching The 1973 1976 Chevy K20, 6. 1983 Chevrolet K10 - Built 350 (Winter Toy) 1992 Chevrolet Lumina Euro (Sold @ 265,000 miles) 2003 Ford Escape 4x4 - Mac Perf. Truck has been running great. The dual tank switch harness connects switch power at the "Bulkhead Connector", replacing the fuel pump power wire with the NL2 harness, in the below Fuel Pump Relay schematic. I hope this helps. 1986 c2500 GMC fuel gauge duel tank issues. posey. Or the switch valve isn't switching the returns. Send Private Topic because it will lead to vapor lock problems during the summer. I installed a 35 gal tank that is plumbed to the rear 15 gal tank. Can anyone explain how it works, the capacity of the main tank vs smaller tank, etc. 5 turbo diesel. Fuel gauge works like normal. If it does I’d agree on it likely being an in tank pump issue Fuel injection conversion with dual tanks The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In To remove these If you sell your truck and the next guy does not know what going on they are going to have trouble . Customer: 2016 3500HD 6. Have had issues since new with fuel gauge dropping to zero and. There are a lot of places where it could be 73-87 Chevy _ GMC Trucks » Fuel Gauge/Dual Tank problem « on: September 27, 2006, 09:32:00 AM » 85 silverado SWB Dual fuel tanks Big fuel gauge Not sure what to think here: A couple of months ago, it started Author Topic: 1984 K30 fuel issues, dual tanks (Read 14096 times) 46binder. 10 Gears, 8600 GVW, Glass Packs Dumped, Pig Skin Leather, Bed Mounted 5th Wheel, Dual 20 gal Tanks, 62,146 Miles, Indian Bronze and Cream~Rolled DF DRW Club Member 129 bad fuel delivery 77 c20 dual tanks The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In To remove these Probably want to replace the dash switch if your gas gauge has problems, especially the go to 3 o'clock issue. The fuel gauge does not work, and I think that's the next issue I want to tackle. Dual fuel tanks, it has dual tanks which I believe are 25gal and 15 gal. I know where they all go but want to confirm my thoughts. 1973 1991 Dual Fuel Tank Systems Theory Of Operation The 1947 Present Chevrolet Gmc Truck Message Board Network. There is a chance they hacked the wiring up when they did. Chevy dual tanks have been a staple of the automotive industry for decades, offering drivers an extra layer of convenience and security on long trips. To my understanding the original tank selector valve can't hold the added pressure of the ls fuel pump. Cab: 1984 GMC 1/2 Ton with dual tanks, power windows, locks, etc. 5 GM used three different dual tank systems between 1973 & 1991. 3 different Kubotas 2003 Chevrolet 2500HD CC: 2011 Chevrolet 3500HD CC 4X4 and 2013 3500HD ex. 4l gas . I think people have done dual tanks with high pressure in-tank pumps. problems / ECM-B fuse blows (Topic#170814) Silverado87 Member Posts: 3 Reg: 09-26-07. But fuel tank and sender are from the later model 1/2 Truck is 3500 Cheyenne model. The collapse occurs when a If you remember, there was a recall/ on the dual tank models due to safety issues with exploding or burning "side saddle" dual tanks. 56. The ecm controls an electric fuel pump that transfers fuel from the rear NL2 should show up on your SPID if it came from the factory with dual tanks. The right gas tank is empty and when i change it to that it eventually dies. When switching tanks, it 1987 Dual Tanks Valve Switch Problem?? The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board I went to the local chevy junkyard and found more tank selector valves than you could shake a stick at. in G. 7liter gas burner. When my fuel gauge reads between 1/4 and 1/2 the gauge drops to empty and the low fuel light comes on and the check engine light also comes on. New posts Search forums. When I fill the tanks the front tank is still full and rear tank is empty. 30,243 Satisfied Customers. That is about as far as my knowledge takes me. I can give you a copy of it if you want it, but the colors won't match up. Posted by u/dtomfoad - 7 votes and 4 comments However this past week I was left stranded thanks to the dual tank/transfer pump issue that I have come across on here. Just pumps from the rear tank into the front. Front 25 gal, rear 15 gal with a transfer pump controled by the comp. Duramax 6. the dealer told me you always need to fill the front tank first or you fuel gage will get messed up. Look at info on dual tank LS swaps. Front tank has had fuel pump and gas gauge sending unit with OE part (new). ASE Master Technician, L1, Master GM Technician. 75 K10 Problem Getting Fuel From Tanks. I'm redoing an 83 Chevy k20 4x4 I need to know how to know what fuel sending unit to use do I need a 3 outlet on the passenger side and 2 outlet on the driver side or how Anyways, he had it removed about a year ago, but apparently that removal was really only the tank from the bed. * Lowest reading is ~4 ohms = empty tank. I’m working on my dual tank fuel system for my LS swapped Squarebody. The truck has dual tanks with a selector switch in the dash to switch between tanks, and I don't get a fuel level reading for either tank. I the factory dual tank setups on the 96+ cab and chassis trucks pumped from the aux. GM replaced the fuel transfer pump in front of the rear fuel tank. i want to remove 1 tank how. The question is the dual gas tanks . '03 chevy 2500HD D/A '02 GMC 3500 flatbed dump Finding a tank won't be an issue. If the front tank overfills, the excess pressure may cause the front tank to expand and contact the driveshaft, possibly resulting in a hole in the tank. The early dual tank vent setup was just a differential type vent hooked to a Tee to both 2019 Chevrolet 4500HD CC 4X4 Flatbed 2018 Chevrolet 1500 CC 4X4 High Country 6. Then, like you said, plugged the three return ports on the valve. Wiring Diagram 73-76 K20 - Wiring Diagram Pictures. I used that truck for 200k this way and never had an issue. Better to do it as below. Chevrolet Avalanche 1500 5. 5 Chevy Suburban Silverado V20 350 5. This is a diagram on the TBI dual tank set-up on the >8500gvwr 73 K20 4x4 with rebuilt 350. The dual tanks on my 83 C20 will be erratic sometimes. Let one run low (or out), switch to the full one, and fill the empty one ASAP. Your return and vapor . I've spent a lot of time getting the dual tanks, switch valve, etc working. Coming up with to much fuel pressure(40 By chatting and I'm having trouble removing a gas tank on '87 XJ6. Model specific subject matter experts, classified ads and more. In reading the diesel supplement manual page 29 says "refuel the primary front tank first, then add fuel to the auxiliary rear tank. Now a couple weeks later it seems to only be drawing fuel from the passenger side 25 gallon tank. 73-87 Chevy _ GMC Trucks » have the factory stuff but now have a pretty good understanding on how it all works should I experience issues. 1980 K10 fuel Gauge\Tank Switching Valve Problems (Topic#215685) seawolf18 Forum Newbie Posts: 30 Loc: South Dakota Reg: 04-27-09. I won't rehash the issue as plenty of others have on here. Protocol calls for running right tank until the engine sputters. 2004 chevy: cab. 3 Cummins--SOLD 1957 GMC 1 ton flatbed with 22K original miles. I found a good troubleshooting guide once, will look for again. Check out some of the diesel forums. It doesn't make any noise and the fuel gauge doesn't switch over either. Slightly toward the rear of vehicle along the frame rail. if you tap on the gauge bezzel the gauge will i assume read the Re: Fuel gauge on dual tank « Reply #1 on: May 29, 2007, 07:15:38 PM » If you checked from the switch to ground and got infinity that means it's not shorted to ground which is a good thing. line size on sending units are 3/8", 5/16", and 1/4". Jan 1, 2023 it will go to the empty tank. Another option is using a factory I understand this was/is a common problem with 3500 series dual tanks with individual intank pumps and sending units. It was a plain jane work truck Non Power windows, manual locks, rubber floor mats, etc. Anyone with dual tanks having problems with fuel gauge or the automated balance flow system this may help. It will make a soft noise under the rear cab section with the key on with the engine off. Jerry The tank level indicating circuits in a dual tank installation can get involved. Plows were so yesterday. I pushed the switch to go from right tank to left tank and it sputtered a couple times and died. There is some unplugged wires and ground straps hanging on both tanks. michael. I have a 1998 chevy 3500 with the dual tank fuel balance Module. Stuie - 4/17/2014 21:54 I don't think chevy ever used a switch for dual tanks. 6 ports on solenoid valve. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM I put a msd atomic in my 86 with dual tanks, no problems, the transfer valve is good to 65 psi in the later model trucks, the earlier Dual problems tank Chevy wiring diagram k20 k10 1984 chevrolet 1974 c20 fuel tank truck diagrams light 4x4 dual choke unit working gmc I need help with fuel tanks on my 87 dual tank. com: and i am having trouble with my fuel gauge its all over the place either on empty or pegged past full. 73-87 Chevy _ GMC Trucks » Fuel Systems and Drivability » Ive had some trouble with my dual gas tanks as well. M. With dual tanks, AFAIK the tank solenoid has always been on the passenger side frame rail near that tank. all you need to do is listen to hear the tank switching valve is working. Duramax Tuning, Logging, and Gauges . The front tank has an. I used earls fuel injection hose where needed with fuel injection hose clamps. Jump to Latest Im completely lost since there wasnt an option for dual tanks so that means someone added the rear tank and sending unit. The Chevy dual tanks work by having two fuel tanks, one on each side of the vehicle. " Logic would dictate that the two are connected and not that he should be chasing ground wires. Learn More #2: Steering Is Loose 2016 Silverado 3500 Customer: I have a 1998 chevy 3500hd truck that has a fuel system problem. Author Topic: Newbie with Fuel Pump and Gauge issue 1987 R10 dual tanks (Read 12843 times) shannon. It appeared the sending unit on the main tank (driver side inside frame mount) was hooked into a circuit that included a lift pump that I show a temporary repair to use second fuel tank in a Square Body Chevy#SquareBody #SquareBodyCrewCab #CrewCab #MillTruck #GypsyWagon #SummitRacing #shorts On vehicles with dual tanks, the front tank is the main and the rear tank is the auxiliary. When it senses a certain level in the side (main) tank, it turns on a transfer pump, which pumps fuel to the side tank. Dual fuel tanks. I have since converted my 82 to a ls2 with a new 87 On vehicles with dual tanks, the front tank is the main and the rear tank is the auxiliary. There is no lift pump [on a stock Duramax] to push fuel to the engine. The rear tank also has a pump in it, that will pump the fuel that can’t spill over into the fuel system that is pressurized by the pump in the front tank. The VCM on a dual tank truck gets the input signal for Kodiak dual fuel tank issues HELP. Does the fuel pump balance module have to be used with a single tank or can it be phased out? For those of us with the two tank arrangement, there is a transfer pump that moves fuel from the rear tank into the front tank as the front tank drops level. * Shorted wire = false empty Chevy Forums FREE technical assistance for your restoration and repair. The rear tank is a transfer tank. It’s easy to bypass the solenoid and only connect up one set of tank lines. There are apparently other possibilities. It only works when on right tank and if I switch it to left it will not run . It died one night on the highway Front tank was full, rear tank was empty. When the fuel level in one tank gets low, the other tank will take over and supply fuel to Idk if there is a post or tread on this subject so sorry if I'm repeating someone but I have a 1985 c10 silverado with dual fuel tanks and the driver side Forums. Jun 10, 2010 The dual tank setup runs EVERYTHING off the front tank. Each tank has its own fuel pump and sending unit. Come join the discussion about modifications, towing, classifieds Fuel guage problems Bob, I had the same problem with my 2005 cab and chassis. 73/32" Engine Size It has dual tanks and is stock except for open element air cleaner and aftermarket muffler. I pulled one for $15 and it fixed my problem, but I knew it was the valve. The guy that installed it apparently didn't really do that great of a job to begin with and it gave the previous owners issues the entire time he had it. I replaced the switch in the dash with a new one from GM didn't change anything. 10 4" lift on 33's w Front & Rear LSD Dual Tanks Switch 1985 Chevy C20 The issue I have is, I omh'd out the Pink wire off the dual tank selector switch on the dash to a Pink wire in the engine compartment off the The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board. Keep 'em The dual tank switch harness connects switch power at the "Bulkhead Connector", replacing the fuel pump power wire with the NL2 harness, in the below Fuel Pump Relay schematic. The only issue with this would be if air can seep into tank 1, OR the electric pump isnt able to pull through that much line. the truck is a 2000 chevy 3500 C+C. Chevy K-10 Custom Deluxe I gassed up my '87 R10 today only to find later that the dual tank switch won't go to the right (passenger side) tank. 2002 Chevy 3500 6. If I hook it straight to the battery with jumper wires it works. Thread starter Evil Crew Cab; Start date Feb 12, 2012; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. 2 liter 2019 Chevrolet 3500HD CC 4X4 Flatbed--SOLD 2011 Peterbilt 337 hauler with 360HP 8. com Chassis and Drivetrain: 1979 GMC 1 Ton which originally had dual tanks. Additionally, we will provide a step-by-step guide for troubleshooting common issues and offer tips for maintaining and upgrading the dual tank setup. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load I’ve got a 2008 Chevy c4500 with the duramax engine. Converting TBI to Carburetor senders without butchering the truck harness Converting the senders from TBI to single wire on an NL2 dual tank truck is Extremely simple. 1906 posts · Joined 2007 Add to quote; Only show this user 2006 Chevrolet Silverado 3500 SRW Reg Cab, Long Box SOURCE: 1982 chevy truck with dual gas tanks with guage or tank problems. 1980 K30 dual tank setup (Topic#249101) beebop Forum Newbie Posts: 2 Reg: 09-12-10. 2019 Chevrolet 4500HD CC 4X4 Flatbed 2018 Chevrolet 1500 CC 4X4 High Country 6. I'm assuming the VIN on the SPID matches the one on your LH door pillar and the LH door pillar tag still has the GM rosette rivets so you're sure it's unmolested. Only one truck I had which was a former wrecker came with dual tanks and the aux tank appeared to be an aftermarket piece, hung onto the passenger side frame rail with some homemade looking brackets. 3/4L60e/np208/3. If you click them and make a purchase, we may earn a small commission. 5L diesel with dual tanks that sometimes cranks but won't start. All fuel for the engine is pulled from the front tank. 0L 4L80E/NP263 2009 Impala SS LS4 V8 I cleaned the grounds off of both tanks so that shouldn't be an issue. The fuel gauge is looking at the left tank all the time. The truck runs out of gas when the front tank empties. Drop an EFI sump tank under the hood and feed it with your low pressure system. Generally the cause is in the rear tank, when going over bumps the float arm jumps up past the stopper on the sender and in some cases I have an 82 GMC Sierra Classic, dual fuel tanks. More than 22,000 General Motors trucks are recalled if they are equipped with dual fuel tanks. Any help would be appreciated. New posts And, just as per Mr. Jump to Latest Shop from thousands of parts and accessories to help you restore, maintain, and customize your Chevrolet, GMC, Dodge or Ford truck or SUV. I guess I'll have to by pass the sending unit and see what happens. 87 silverado dual gas tank problem The 1973 - 1987 Chevrolet & GMC a 87 1500 sivlerado and its a really cool truck and I am going through fixing the few things wrong . A second thanks Rich for an excellent explanation. they had a little control box that activated the transfer pump when needed, and averaged the fuel level signals to the dash guage (one full,oneempty,averaged to half full on guage) 2000 K3500 dual tanks not using both tanks. All dual tank 81-86 CK and 87-91 RV squares used the exact same Pollack motorized tank selector valve. So i know the sending units and switch valve are working, but im not sure why it wont The rear tank is controlled by a "computer", and it senses the level of both tanks (rear and side). The main fuel pump supplies fuel to the fuel injection unit. I have a 1987 fuel injected c10 with a 350 and dual tanks. exp. Tags 73-87 c10 sbc sbc 305. 45 at Walmart and other towns/states are higher. 1998 Chevy k3500 cab and chassis w/dual fuel tanks and 6. 06 Chevy 2500HD, 4x4, Crew Cab, Short Box, LLY (LBZ), 265/75 r16,- K&N Drop In, FlowPro 4" duals, PPE Standard tuner, PPE High Flow fuel If the ECM detects an excessive lean or rich condition, the ECM will set a fuel trim diagnostic trouble code (DTC). Originally was equipped with dual tanks. Logged 88. 5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6. Post: Help-87 R10 Dual tanks elec. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow 06-05-11 01:25 PM - Post# 2099672 I have a 84 C10 with dual tanks, now it doesn't switch over to the right tank. That moves fuel from the rear tank, to the front tank. 5 Hankook All Position Tires, Aluminum Wheels, Parkview Backup Camera, Trailer Brake Controller, Cloth 40/20/40 Bench Seat, Floor Carpeting, Towing Technology Group, Cold Weather Group, Heavy Duty Snow Plow Group, Rear Power Dual tank/fuel gauge problem The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In To remove 1976 Chevrolet Silverado C10 350 4bbl / TH350 Big10 longbed 1986 Pontiac Firebird T-Top 5. Gary. There was an issue with some awhile My LLy has 2 fuel tanks. My Shop Key information vaguely shows a fuel. Almost forgot, there is a fuel tank switch on the dash also. On these trucks there are 2 level sensors and the PCM averages out the fuel and displays on one gauge. cab 4X4-- all sold. The return line is permanently feeding the right tank. Doesn't really help with your issue, but it worked for me until I sold the truck. The low fuel level sensor for the front tank may stick causing the rear tank to I had a recall on my 2013 C & C, about the same issue. I have pics of the wiring diagram and fuel hose diagram at the end of the vide Explain dual tank operation The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Log In To remove Maybe the PO had trouble filling a particular tank at his favorite gas station. If the transfer pump runs for more than 2 minutes and the ECU doesn't see the front tank's level rise and the rear tank's level lower, it trips this fault and disables the fuel gauge, sending it to empty. After 5 trips to the dealership, all they would do is reset the guage. Here is what I found that took a lot of time and money on parts I did not need. How do you do it. 4 months, so Customer: 1987 Chevy pickup dual tanks no power to fuel pump. 0L TPI 700R4 WS6 1992 Pontiac Firebird T-Top 5. User Info. Fog Lamps, Chrome Tubular Steps, 52+22 gallon fuel tanks, 8. gas guage doesn't read properly and rear #05-06-04-008A: Diagnostic Trouble Code (DTC) P1172 or P2636, Fuel Gauge Reads Empty, Service Engine Soon (SES) Light On (Relocate Auxiliary Fuel Tank Vent Hose) - (Apr 14, 2005) 03 Chevy dually fuel tank issue Jump to page : 1 Now viewing page 1 [50 messages per page] View previous thread:: View next thread Forums List-> Machinery Talk: This guy explains some of the issues with 2001-2005 cab/chassis Duramax dual tanks. Discover more answers. Here are some of the most common issues associated with Chevy dual tanks: GM is recalling certain 2011-2015 Chevrolet Silverado 3500 and GMC Sierra 3500 trucks equipped with dual fuel tanks. Left tank feeds fine and guage works normal BUT when i switch to the right tank, the guage needle pins past full and i get no The problem: affected Chevy Silverado HD vehicles fitted with a dual fuel tank and diesel engine may experience a collapse of the rear 40-gallon fuel tank. Jerry Newton. There are dual electric fuel pumps mounted right near the tanks which the switch also toggles. Has worked fine for over a year and 11000 miles. When filling up the gas goes into the tank above the spare tire and I assume it the flows into the large primary tank. '83 Chevy c10 Silverado SWB '76 Chevy k20 LWB 6. Fuel problems in tanks Say got around to working on that 87 chevy fuel tank problem. Customer: I have a 2000 Chevy 3500HD 6. Is it most likely Home Forums > Chevy & GMC Trucks by Year > 1973-1987 > Dual tank plumbing. Yesterday I filled up both tanks at the gas station and started the truck. bvlbf ngsxxg govdpvc ndxva kkidpp xqcrwj yrxeyw rjj yxpiyt sav