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  •  » Gas Cap Venting

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    7/02/2014 4:01 PM  #1

    KeithP
    I FYI 24-7

    Offline

    From: Scottsdale, AZ
    Registered: 6/10/2013
    Posts: 379

    Gas Cap Venting

    Been noticing that the new Scott Drake gas cap on my 1966 does not vent enough. Went for a 45 minute drive today and when I stopped for gas the gas cap was hissing like it was letting a little air into the gas tank. When I unsrewed the cap there was a tremendous whooshing letting air into the gas tank. Seems as though the venting in the cap is not good enough to equalize the pressures. I took the gas cap apart and it seems to be working as designed. Anybody else have this problem?

     

    1966, vert, 347 stroker, T5z, 4 wheel disc, pb, 3.70 LS 9", EPAS
     

    7/03/2014 6:31 AM  #2

    Bullet Bob
    Senior 24-7 FYI Addict

    Offline

    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,892

    Re: Gas Cap Venting

    You don't say, so I'll ask...are you runnng  EFI, Keith?  And, are you posiive the pressure in the tank was negative?  My stock 66 cap has will vent "in" but it will not vent pressure out.  Ever see a fuel tank that looks like a beach ball?  I have.  They weld those seams pretty well, I guess.

    BB

     

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    7/03/2014 10:08 AM  #3

    KeithP
    I FYI 24-7

    Offline

    From: Scottsdale, AZ
    Registered: 6/10/2013
    Posts: 379

    Re: Gas Cap Venting

    No EFI. It was sucking air into the gas tank, so negative pressure in tank. I don't think there's a large enough of a vent in the gas cap(new Scott Drake). I have an old original gas cap laying around. I am going to put that back on and see how well that one works.

    1966, vert, 347 stroker, T5z, 4 wheel disc, pb, 3.70 LS 9", EPAS
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