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  • dual fuel tank problem

    I have an 87 swb tbi 350 with dual tanks. my left one works the right one doesn't. I can hear the left fuel pump come on. but when i switch it to the right one i hear nuthing. Is it the switch or the fuel pump. or is anything else i can check. any help would be appreciated.
    2004 Dodge Ram 1500 quad cab. yea its got the HEMI.
    1987 chevy R10. 305 TBI with TH400. Dakota digital gauges. (And yea it smokes the HEMI)


  • #2
    Re: dual fuel tank problem

    does the truck stay running when switched? i beleive the 2 tanks use 1 fuel pump. check too see if you have clogged lines

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    • #3
      Re: dual fuel tank problem

      Originally posted by trickedout420
      does the truck stay running when switched? i beleive the 2 tanks use 1 fuel pump. check too see if you have clogged lines

      nope it dies instantly
      2004 Dodge Ram 1500 quad cab. yea its got the HEMI.
      1987 chevy R10. 305 TBI with TH400. Dakota digital gauges. (And yea it smokes the HEMI)

      Comment


      • #4
        Re: dual fuel tank problem

        check to see if te valve is actually moving. have someone flip the switch while your under holding it to see if its getting power. then check for plugged lines and i guess check to see if it has a pump

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        • #5
          Re: dual fuel tank problem

          My '82 has the same problem but has mechanical fuel pump. I finally got fed up and siphoned out the gas from the right and put it in the left. For sure check the wiring, then the switch, etc.
          2007 NNBS CC Z71-Magnaflow, K&N CAI, 2.5" level, Cooper 285's
          1999 C2500 Suburban-New L31
          1974 K20 Cheyenne-350/TH350/NP203

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          • #6
            Re: dual fuel tank problem

            an 87 tbi will have a fuel pump in each tank, if you hear nothing when you switch, its probably the fuel pump. I have an 87 LWB 350 tbi and i can hear both pumps running
            06 Intimidator SS
            90 454 SS
            87 Chevy 4x4- show truck with NOS
            67 lowrider- flame-throwin daily driver

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            • #7
              Re: dual fuel tank problem

              It has two fuel pumps on tbi. When mine did that, I took the switch apart and cleaned the contacts (They were corroded and filthy as hell) and put new die-electric grease in it and it worked fine ever since.
              Kenny

              1978 C-20, 350/400, 3.73, Graystone Metallic, Raceline Renegade 8 Wheels - 18x8.5, 275/70R18 BFG KO's

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              • #8
                Re: dual fuel tank problem

                Originally posted by Porno Joe
                if you hear nothing when you switch, its probably the fuel pump.
                I would have thought the opposite.
                Pete :bowtie:
                1987 V20 Silverado RCLB: 350/SM465/NP208/10-bolt/14-bolt SF
                I know enough to know that I don't know enough.

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                • #9
                  Re: dual fuel tank problem

                  thanks guys i appreciate it. i guess im gonna check the switch before i drop the tank and change the pump.
                  2004 Dodge Ram 1500 quad cab. yea its got the HEMI.
                  1987 chevy R10. 305 TBI with TH400. Dakota digital gauges. (And yea it smokes the HEMI)

                  Comment


                  • #10
                    Re: dual fuel tank problem

                    well thats good i didnt know it used 2 pumps good info to know for next time. i have a fuel cell mounted in my tool box (20 gallon) and have a holley red pumping it up front. works good and the original fuel tank still works thougt about making some sort of duel tank setup for it.

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                    • #11
                      Re: dual fuel tank problem

                      i dont have my truck with me to look, but on the tbi trucks, doesn't the power to the pump go thru the valve(so that when you switch tanks the power goes to the other pump)? You might want to try cleaning the connections at the valve to if this is the case
                      06 Intimidator SS
                      90 454 SS
                      87 Chevy 4x4- show truck with NOS
                      67 lowrider- flame-throwin daily driver

                      Comment


                      • #12
                        Re: dual fuel tank problem

                        Originally posted by NovaMan
                        I would have thought the opposite.
                        Its just like when you turn on the ignition but dont start the truck, you can hear a fuel pump running in the tank, same thing here, if you switch to the tank and the truck dies, turn the truck completely off and then turn the key to "run" and listen for a fuel pump.
                        06 Intimidator SS
                        90 454 SS
                        87 Chevy 4x4- show truck with NOS
                        67 lowrider- flame-throwin daily driver

                        Comment


                        • #13
                          Re: dual fuel tank problem

                          Originally posted by Porno Joe
                          Its just like when you turn on the ignition but dont start the truck, you can hear a fuel pump running in the tank, same thing here, if you switch to the tank and the truck dies, turn the truck completely off and then turn the key to "run" and listen for a fuel pump.

                          yep did this and heard nuthing. say i need to check the connection at the valve as well? where might the valve be?
                          2004 Dodge Ram 1500 quad cab. yea its got the HEMI.
                          1987 chevy R10. 305 TBI with TH400. Dakota digital gauges. (And yea it smokes the HEMI)

                          Comment


                          • #14
                            Re: dual fuel tank problem

                            the valve is on the frame under the pass side door
                            06 Intimidator SS
                            90 454 SS
                            87 Chevy 4x4- show truck with NOS
                            67 lowrider- flame-throwin daily driver

                            Comment


                            • #15
                              Re: dual fuel tank problem

                              before determining that "just because the switch is pushed and the pump isn't running its the FP" you have to first get around the switch (like jumper wire the switch...take the switch out, figure out which wires in the plug do what and jump the one that would make the truck think it's using the right fuel tank...a Haynes manual should tell you this) to make sure it's not just the switch not doing its job. if you jump it and it STILL doesn't come on, then you've narrowed it down to either the pump or the wiring...because if i'm not mistaken the valve just changes the fuel flow...the SWITCH is what activates/deactivates the FPs...i think...lol

                              2004 GMC Sierra SLE Z71 rcsb, 5.3/4L60E/3.73/G80 time bomb...3" lift, tinted 03+ Silverado tails, plasti-dipped 16" wheels (unknown brand), 285/75/16 Thunderer M/T Extremes, Thrush Welded muffler...

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