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Thread: GAS TANK FILLER NECK, BACK-FLOW

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  1. #1
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    GAS TANK FILLER NECK, BACK-FLOW

    put a so-called "back flo preventer" in my `57 filler neck,does not work, period.

  2. #2
    Registered Member WagonCrazy's Avatar
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    yeah, I'm having the same issue with my setup too. Hard left handers seem to leave the residual smell of fuel. I'm sure it's getting past that preventer, and ejecting out the filler neck.
    1957 Nomad- LS1/T56 on C4 chassis
    1959 Fleetside Apache 1/2 ton, shortbed, big window, 327ci.

  3. #3
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    i mean i can not fill the tank, anyway, anyhow, without it splashing out. ordering a new "o" ring and yanking it out. ordering an "o" ring, just to be sure.

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    Registered Member BamaNomad's Avatar
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    The filler tube on a stock tank (sedan or wagon) is not IN the top of the tank, but instead comes into the tank at the top of the SIDE of the tank, so if you fill your tank absolutely FULL, the filler tube will have several inches of fuel in it as well, and of course the filler tube is not exactly vertical either...

  5. #5
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    the new O ring is in thev mail, just ordered it in case i moved it around, so, anyway, we`ll see, but i doubt it. let ya know. thanx

  6. #6
    Registered Member Belair-o's Avatar
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    Hi Dave,
    When you say it doesn't work, you mean fuel still sloshes out of the fuel tank filler neck under acceleration?
    Regards, Doug

  7. #7
    Registered Member WagonCrazy's Avatar
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    When you say it doesn't work, you mean fuel still sloshes out of the fuel tank filler neck under acceleration?
    Doug's asking a legit question here.

    In my Nomad, I have no problem filling the tank without it splashing back. But when driving it, and cornering hard left with anything more than a half tank of fuel...it comes out past that backflow flap setup and leaks out the filler neck by the cap.

    Its not quarts of fuel leaking. Just enough getting by to smell when it comes all the way out.

    I suspect the design of this filler backflow preventer could use some improvement. Meaning, it's not "fuel tight" in its design. Its just a gravity balanced, oval shaped flap of steel inside. It's definately not resting against any kind of seal in the closed position.
    1957 Nomad- LS1/T56 on C4 chassis
    1959 Fleetside Apache 1/2 ton, shortbed, big window, 327ci.

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    i have no idea about acceleration, i`m not behind the vehicle, nyuk,nyuk, nyuk! but when filling it,,,,,,, all over the place. and i know it`s a legit question. and i tried different ways of filling it, for example, the noxell is`nt in to far, to hold it open. thanx.

  9. #9
    Registered Member Belair-o's Avatar
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    Quote Originally Posted by WagonCrazy View Post
    Doug's asking a legit question here.

    In my Nomad, I have no problem filling the tank without it splashing back. But when driving it, and cornering hard left with anything more than a half tank of fuel...it comes out past that backflow flap setup and leaks out the filler neck by the cap.

    Its not quarts of fuel leaking. Just enough getting by to smell when it comes all the way out.

    I suspect the design of this filler backflow preventer could use some improvement. Meaning, it's not "fuel tight" in its design. Its just a gravity balanced, oval shaped flap of steel inside. It's definately not resting against any kind of seal in the closed position.

    Hey WagonCrazy,
    Well that is a bummer, since that is exactly what the backflow flap is supposed to cure. Drat.
    Thanks, Doug

  10. #10
    Registered Member BamaNomad's Avatar
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    Even if there was an 'absolute' stop valve in the filler neck, when the tanks are FILLED, there would likely be fumes and a little gasoline coming thru the vent hose...

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