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dual Fuel tanks

Discussion in 'The Garage' started by Tshane, Aug 1, 2003.

  1. Tshane

    Tshane 1/2 ton status

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    My truck is set up for dual tanks but the guy that had it before me unhook both tanks when he painted the truck and only hooked up one... i find this a waste to have that extra tank sitting down there and not being used and that be nice having 2 tanks with a hungary v8...the problem is my haynes manuel doesnt have a good diagram of how the fuel lines are suppose to run from the valve and the tanks... i was wondering if anyone out there had a good diagram sence it looks like a maze of different lines down there... hopefully someone can help me out /forums/images/graemlins/truck.gif
     
  2. bryguy00b

    bryguy00b 3/4 ton status

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    if you drop the tank you want to hook up the lines are probobly sitting right there..now what lines hook up to which line on the sender i done know..and i need to find out the same thing cause im in the middle of putting a new 20 gallon tank in my truck in place of the leaking twin 16's.
     
  3. Tshane

    Tshane 1/2 ton status

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    yea well the other guy unhooked everything so i'm really lost
     
  4. Tshane

    Tshane 1/2 ton status

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    come on someone out there has to have some info on this. HELP! lol /forums/images/graemlins/1zhelp.gif
     
  5. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    Depends on the year of the truck. The older ones just have one line from the sender of each tank that goes into a solenoid valve that is hooked to the hard line that runs up to the fuel pump. If the valve is missing you need to get one.
     
  6. bryguy00b

    bryguy00b 3/4 ton status

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    thats how mines setup i think..mines an 86
     
  7. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    Even if it is 79(I think) or newer all you need are the two 3/8" lines you can plug the rest they were just for emission equipment.
     
  8. bryguy00b

    bryguy00b 3/4 ton status

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    yea ones for the carbon cansiter i think..which isnt even hooked up on my truck so who cares..
     
  9. m j

    m j 1/2 ton status

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    dont some use a return line?
    isnt his TBI which would have a return line?
    even so it is pretty simple to figure

    1 line from each tank(2 total) to selector valve for fuel to engine
    1 line from each tank(2 total) to selector valve for return of fuel or vapor
    then 1 line from selector to engine compartment for fuel to engine
    and 1 line from selector to engine compartment for return of fuel or vapor

    the fuel to engine lines will usually be larger then the return/vapor lines

    usually there is a single wire to trigger the solenoid and the unit grounds through the mount

    if that isnt correct spit out a description and someone will figure it out in short order
     
  10. ntsqd

    ntsqd 1/2 ton status

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    mj, you've got the tbi plumbing right, don't know about his truck.

    The 6 port selector valves are a bit more expensive than the 3 port valves. You absolutely can not run the return to only one tank. Major fire hazard there.
     

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