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  1. #1
    Bald Tire
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    16 gallon tank H1?

    This has got to be an issue with slosh or overfill. But I swear I only get 16 gallons in my tank. I have been working on my rig, it was a 6.5L diesel, converted to a BBC 502. I have spent the entire ownership of 5 months on the interior and adding a Sniper EFI to it.
    Had to run the EFI return line to one of the breather venta in the tank. Thankfully there are two. But I only get 16 gallons before it shuts off, full. I'm a 1993 H1, so there is only one tank on these.
    Need help knowing if my trailer queen is going to be dropped off at the gas station every damn trip.

    Thanks in advance!


    Sent from my LM-G850 using Tapatalk

  2. #2
    Super Moderator
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    The truck originally came with a 28.5 gallon tank, of which about 25 gallons was considered useable. Has the tank possibly been replaced at some point with an after market tank?
    1998 H1 Open Top
    1994 H1 HMC4
    1992 H1 HMC4 LE
    1990 1025 Armament Carrier


    KJ6JCC

    BlackSheep Hummer Squadron, H1 PsychoSquad

  3. #3
    Bald Tire
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    Nope, it is original, and can tell, based on the very antiquated shape.
    When the BBC swap was done, they left the stock sending unit, and did an AN fitting at the base of the tank for an external pump. There is something I feel I am missing other than dropping the tank

    Sent from my LM-G850 using Tapatalk
    Last edited by MattySchep; 07-15-2021 at 05:55 PM.

  4. #4
    Super Moderator
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    Check the two tank vents? One in the engine compartment on the passenger side by the firewall and one on the passenger side at the rear of the truck under the fender.
    1998 H1 Open Top
    1994 H1 HMC4
    1992 H1 HMC4 LE
    1990 1025 Armament Carrier


    KJ6JCC

    BlackSheep Hummer Squadron, H1 PsychoSquad

  5. #5
    Bald Tire
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    Leander Texas
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    The vent by the passenger firewall was bypassed when I got it(hard plastic line with a check valve on it?). Might have also been a return line, but got melted before my ownership by the exhaust, and so inoperable.

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