Buick GNx sending unit and pump

Discussion in 'G-Body LS Swap' started by theIrishman, Jun 10, 2018.

  1. theIrishman

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    Has anyone had success with using a Buick Grand National fuel tank sending unit and pump (or aftermarket high volume/pressure pump) in a 1978 and up Malibu fuel tank, Ls 5.3?

    Or has anyone modified an original Malibu sending unit to work with an in-tank electric pump, and added a return line?
     
    #1 theIrishman, Jun 10, 2018
    Last edited: Jun 10, 2018
  2. Pronto-

    Pronto- Not-quite-so-new-guy

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    If your going FI then you want the tank for a Turbo Buick with the dog dish and splash guard so you don't end up sucking air on a hard corner or launch.
     
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  3. UNGN

    UNGN Royal Smart Person

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    A GN tank has a sheet metal wall that runs down the middle:

    T-type tank 2.jpg

    Doesn't do much for corners, but makes sure the pump doesn't suck air when accelerating. Carbs have bowls and don't have to worry about a couple seconds of air..
     

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  4. MC96

    MC96 Greasemonkey

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    Ive been told the FI sender in a non efi tank isnt a big deal in autocross, as long as you have it above 1/4 tank.

    I would imagine you wouldnt see many issues street driving it
     
  5. fleming442

    fleming442 Comic Book Super Hero

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    *1/2 tank... living it
     
  6. UNGN

    UNGN Royal Smart Person

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    In autocross, I wouldn't trust an EFI tank with less than 1/2 a tank. My T-type will starve on an aggressive on ramp at 1/4 tank. Yes, I probably take onramps faster than most people, but factory GN tanks are really only for acceleration and not for cornering.
     
  7. 20Grand

    20Grand Apprentice

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    I’m using a fuel tank from a Monte, about the same as your GI, and just drove it across the country. I’m using an AC Delco pump tho.
     
  8. 20Grand

    20Grand Apprentice

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    But, I think you can get away with the stock tank with upgraded pump and sending unit. My mechanic that builds LS swaps also confirmed, but wanted to be safe on long distance trips. If you do the swap, order without fuel tank neck and order YOUR fuel neck and install.
     

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