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Click on image for the lowdown. 
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9 members (TUTS 59, moparguy, 50Chevy3100, FAST55, Wally / Montana, Wickedbass, Mike Burns, Gdads51, Donf),
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Global Mod,
Mod | | | Forums66 Topics128,065 Posts1,055,870 Members48,428 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | If I'm not mistaken, the gas cap on 1930-70s chevy trucks is a one way vent.
Allows air in but not out.
So if the system is properly sealed then hot gas will build vapor pressure in a parked truck.
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