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Thread: Problem filling stock tank?

  1. #1
    Senior Member Carroll Shelby
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    Problem filling stock tank?

    My 4th gen still runs the original 15.5gal metal tank from the factory, but with a new-in-2012 delphi pump/sender assembly.

    Lately I've noticed it has gotten increasingly difficult to fill up the tank after a session. I'll see the fuel gauge (stock sender going to the IQ3 dash, so I'm seeing the actual, unbuffered reading) go down after each session, but after 30 minutes of sitting I can barely get 1/2 gallon (when it should take multiple gallons) into the tank before I completely fill up the filler tube (with the fuel sender still sitting lower than full).

    I've revised the fuel venting setup multiple times since this issue has become noticeable, with the latest iteration being both the 3/8" and 5/16" teed into a straight 1/2" hose, with no improvement/change. At ECR I even some vacuum on the vent hose to see if I can get the tank to "burp" and take more fuel, to no avail. It really takes it sitting for quite a while for it to be able to take more fuel.I've resorted to having to wait a couple hours for it to cool off, then jacking up the LR corner to get any reasonable amount of fuel in.

    Is there a valve or something else inside the tank that's causing this?

  2. #2
    Senior Member Carroll Shelby Rob Liebbe's Avatar
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    Some, if not all, modern cars have a one way valve in the filler neck or tube to prevent fuel leaking out if the car becomes inverted. This could be stuck "closed" for some reason. Some cars may certify to this standard with the feature built into the gas cap itself.
    Rob Liebbe - Texas Region
    Camaro, Mustang, doesn't matter to me, I'll race it.

  3. #3
    Senior Member Carroll Shelby GlennCMC70's Avatar
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    4th gen have a check ball in the neck about 12 inches down. I have seen them get stuck. It pressure builds it will stick. Sounds like your problem for sure.

  4. #4
    Senior Member Carroll Shelby Supercharged111's Avatar
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    I thought it was common to bash them out on our cars? Mine doesn't have that valve anymore and the mouth has also been hogged out to fit a giant ass funnel down there.

  5. #5
    Senior Member Carroll Shelby
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    Quote Originally Posted by GlennCMC70 View Post
    4th gen have a check ball in the neck about 12 inches down. I have seen them get stuck. It pressure builds it will stick. Sounds like your problem for sure.
    Yeah from what I've heard/read, sounds like it.

    Did you end up having to replace your tank because of this, or can I punch this device out? Having trouble finding solid info online about it...

  6. #6
    Senior Member Carroll Shelby GlennCMC70's Avatar
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    I only knew it was there cause we had a similar issue with a new car build with the tank improperly vented. Ran a aluminum rod down the neck and the sudden pressure release blew fuel out the neck and all over me.
    I have not modifed that part.

  7. #7
    Senior Member Carroll Shelby
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    Guess I'm gonna take a long rod and try punching it in.

  8. #8
    Senior Member Grass-Passer Wade's Avatar
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    This will be an experience you have never had before so take it slow!
    '86 Mustang Coupe - CMC2 34

  9. #9
    Senior Member Carroll Shelby Rob Liebbe's Avatar
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    Quote Originally Posted by Wade View Post
    This will be an experience you have never had before so take it slow!
    Nice.
    Rob Liebbe - Texas Region
    Camaro, Mustang, doesn't matter to me, I'll race it.

  10. #10
    Senior Member Carroll Shelby
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    What about issues when racers do this and then their car spews gas out the side or back when on track? Seems to me that would be a fire hazard but also could cause a slick spot on track. I have seen this before and mentioned it to a racer who just brushed me off with it. Should we be concerned?

    Tilton-forgot to tell you this but I saw your car spewing gas out the back.
    Bryan Leinart
    CMC #24

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