Gas cap
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Senior User
Joined: Jul 2003
Posts: 218
Likes: 0
From: Spokane, WA
Gas cap
Hi guys - I finally got my '62's engine and tranny swapped out with a 302/FMX combo and diggin' it. I'm using the original gas tank, but purchased a new gas cap to replace the old one due to the gasket being torn and I could smell fumes. Now when I take the new cap off after driving, there is a vacuum and I can hear the tank expand. I've actually replaced the new cap with another new cap thinking it may be defective, and they are a little different, but the problem is still there. Parts store guys are saying I'm using the correct cap. Any ideas? I did remove the tank to paint it; wondering if I may have unknowingly blocked a vent or something. While we're at it, the guy who helped me suggested I run 3/8 tubing from the tank to the carb instead of the 1/4" I'm currently running with. Thanks!
Senior User
Joined: Feb 2004
Posts: 258
Likes: 1
From: East SF Bay Area
I always assumed the tank was vented inside the cab. I can always smell gas after filling until the tank is around half full.
Elder User
Joined: Oct 2009
Posts: 825
Likes: 2
From: Dallas, Texas
, which ain't right; however that can probably be fixed by replacing the rubber fill hose that connects from the fill pipe to the tank OR tightening the hose clamps!! 
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
Peeps remove the sending unit, but usually don't replace the cork gasket when they reinstall it, so the gasket could be well over 40 years old.
btw: The fill hose (C1TB-9047-A - reproduced) is made of neoprene, not rubber. Gas will eat thru rubber within a short time.
Some unknowing peeps use radiator hose in lieu of the neoprene fill hose...Don't strike a match in the cab! KABOOM!
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