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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!
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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: Jun 2010 Posts: 1,001 Shop Shark | | Shop Shark Joined: Jun 2010 Posts: 1,001 | The vent on the "generic neck" (linked above) is not for filling specifically, but rather to allow air to enter/leave the fuel tank. I.e. expel air due to expansion in hot weather (or during filling) or allow air to enter the tank as fuel is used or the tank/fuel cools down. The reason this is required is that the cap for the neck is billet aluminum without a vent (hole). I imagine this type of setup must be filled with fuel slowly.
Normal gas caps are self venting (this vintage anyway). The vent tube in the AD factory tank is for filling purposes only and will only work properly if the gas nozzle is inserted in the fill neck past where the vent pipe connects to the filler pipe.
My $.02 | | |
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