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Old 05-26-2014, 09:54 AM   #2
LockDoc
The Older Generation


 
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Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 26,069
Re: Vacuum in fuel tank

Quote:
Originally Posted by Belairbob View Post
I have a 72 with an earlier year tank. The charcoal canister and lines were removed.
I have a vented cap but also hear vacuum when I remove the cap for fill up. The
Cap has the small hole in it. You can see the check valve through the hole. You can push the check valve in. Wouldn't this be to relieve preasure instead of letting air in? Thanks, bob

I would get a new cap. I always buy one for a '69 or earlier truck just to make sure.... Yours is not vented or it would not hold a vacuum in the tank.

LockDoc
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