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Fuel Leaking From Gas Cap Nightly?

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Jack Coffelt, Apr 3, 2019.

  1. Apr 3, 2019
    Jack Coffelt

    Jack Coffelt New Member

    Justin, TX
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    Been a while guys, got a new job and have been traveling like a wild banshee.... That being said, I had a bad fuel smell coming from the Jeep when I parked it in the garage. I ordered a new "OEM" sealed gas cap and installed it. When I would get home from a joy ride, i could hear and feel the fuel tank gurgeling, which was ne and odd. I have also awoken to puddles of gas on the garage floor the past few mornings, even after replacing the old gas cap? Any suggestions ideas? The V6 had a fuel pump installed at some point in it's history if that helps anything? Thanks guys. I will try and post some pix later of the cosmetic work I've done recently.
     
    cj3may likes this.
  2. Apr 3, 2019
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member Sponsor

    Denver, CO
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    Assuming this is an original style fuel tank, I don't believe the v6 fuel tank is designed for a sealed gas cap - the cap needs to vent as there is no other place for air to enter into the tank as the fuel level drops. Additionally, changes in temperature would cause pressure changes in the tank as well that need venting through the cap. Not sure if the sealed cap is the cause of the puddles of fuel - but it sounds like you might have a leak elsewhere in the fuel system?
     
    Jack Coffelt likes this.
  3. Apr 3, 2019
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

    Medford Mass USA
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    Yep. The under-seat tanks all used a vented gas cap.
     
    Jack Coffelt likes this.
  4. Apr 3, 2019
    Jack Coffelt

    Jack Coffelt New Member

    Justin, TX
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    Thanks FinoCJ, the fuel is dripping on the floor daily directly underneath the gas tube/inlet/cap. Just need to figure out what the actual OEM gas cap looks like to ensure it has a venting capability.
     
  5. Apr 3, 2019
    TIm E

    TIm E Member Sponsor 2019 Sponsor

    NW Arkansas
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  6. Apr 3, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    I'll suggest the obvious... don't fill your tank to the top? :D
     
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  7. Apr 3, 2019
    colojeepguy

    colojeepguy Colorado Springs Sponsor 2019 Sponsor

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    This is actually good advice, if I fill mine and park it in the garage, it doesn't drip out but it sure makes the garage smell of gasoline. If it's down a little bit, no smell.
     
  8. Apr 3, 2019
    Lee Bennett

    Lee Bennett Vicarious Student 2019 Sponsor

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    I just used a small drill bit and added a vent to a sealed cap. Should I expect any issue?
     
  9. Apr 3, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    I did that with my old Ford truck a few years ago and haven't had a problem.
     
  10. Apr 3, 2019
    Greevesman

    Greevesman Sponsor Sponsor

    Napa, Ca
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    I got one of the Walcks ones and have had no leaks.
     
  11. Apr 3, 2019
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

    Medford Mass USA
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    My experience - old cars stink of gas. The typical stink went away when vapor recovery was required for all new cars.

    Vented caps are *supposed* to have a labyrinth in the cap that allows fumes to escape (and air to enter) but stops slosh from exiting ... mostly. The CJ tank is particularly bad in this respect, just because of the shape of the tank and filler.
     
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  12. Apr 3, 2019
    Greevesman

    Greevesman Sponsor Sponsor

    Napa, Ca
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    Yes, old cars stink of gas, and the exhaust smells like an old car too. Sometimes I just start mine up so I can smell that great smell. Like when I was a kid.
    Cars now days don't smell much. I guess all that emissions stuff works
     
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  13. Apr 4, 2019
    Jack Coffelt

    Jack Coffelt New Member

    Justin, TX
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    Thanks for all the input, except the smart alek, but what less could I expect right... I did just buy the new Walk's gas cap, but think it may be due to the serious changes in temperature we've had here in the DFW area, and having filled the tank up fairly recently. I put it outside in the driveway after posting this and have seen no further leakage. Will continue to monitor.
     
    ITLKSEZ likes this.
  14. Apr 4, 2019
    Jack Coffelt

    Jack Coffelt New Member

    Justin, TX
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  15. Apr 4, 2019
    colojeepguy

    colojeepguy Colorado Springs Sponsor 2019 Sponsor

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    That one "should be" vented....might be worth a call or email to Walcks to confirm. I've found them to be pretty helpful in the past.
     
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  16. Apr 4, 2019
    Greevesman

    Greevesman Sponsor Sponsor

    Napa, Ca
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    I have one, it is vented. You can call them to be sure. They are good.
     
  17. Apr 4, 2019
    mickeykelley

    mickeykelley Active Member

    Republic of Texas
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    I too got the one from Walcks and it works. I still have my original but it needs a gasket.
     
  18. Apr 5, 2019
    Greevesman

    Greevesman Sponsor Sponsor

    Napa, Ca
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    I guess I am the smart alec but I was serious when I said I likes the way non smog motors smell. I like the smell of gas and oil and hot motors. I have followed along behind early Mustangs and enjoyed a rich running motor. It is probably better that all our cars are not like that now but it brings back memories of many years ago.
     
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  19. Apr 5, 2019
    Rick Whitson

    Rick Whitson Detroit Area Sponsor 2019 Sponsor

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    I don't fill mine to the top, if I do it will leak when the gas expands, or if I park on a hill.
     
  20. Apr 6, 2019
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    Could always try parking on a 2x8 to raise the driver's side up a little.
     
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