Brian & Steve,
The cap was manufactured by a company named Ceandess LTD which started out 75
years ago specializing in automobile gas caps. Housed inside of the raised
section of the cap is a valve, which seals against loss of vapors to the
outside but when fuel is consumed and a partial vacuum begins to occur the
valve will release inward allowing atmospheric pressure to equalize the tank.
If your tank is near full and rests for days in a hot garage some pressure
will build. This is not a problem and you should ignore it. When you are
near empty there is enough volume of compressible gas that the evaporation
pressure will be very low to not even noticeable.
Brian check out the page link below
http://mysite.verizon.net/phulse/id18.html
Philip "Commodore Blues" Hulse
> Brian,
>
> I am forwarding your gas tank question to the list, as I have not had
> this problem. I never have pressure behind the gas cap, to my knowledge
> (experience at gas pump).
>
> I am assuming that there are plenty of list members who have specific
> experience with this issue.
>
> Steve
>
> ___
> Steve Laifman
> Editor - TigersUnited.com
>
>
>
> Brian wrote:
>
>>Hi Steve, I am currently experiencing alot of pressure on my gas tank{s}. I
>>beleive this also has something to do with my carburetor leaking {newly
>>rebuilt} while at rest in the garage.
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