pressure build up in gas tank - Team Camaro Tech
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post #1 of 7 (permalink) Old Apr 8th, 01, 11:29 AM Thread Starter
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joseph l clance
 
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Whenever I remove the gas cap, a large "whooosh" of air pressure is present. The act of removing the gas cap, is relieving pressure from the tank. The Cap says vented, However, the cap does not appear to vent pressure from the inside, but vent fron the outside. Is there a vent is the system other than the gas cap? If so where is it ?
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post #2 of 7 (permalink) Old Apr 8th, 01, 12:06 PM
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What year is the car?

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post #3 of 7 (permalink) Old Apr 8th, 01, 12:15 PM
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The gas cap has a pressure relief valve in it to maintain a fiew pounds pressure on the tank.
This keeps gas vapor from escaping, which could cause a fire if gas fumes escaped into your garage.
It also keeps your fuel from going bad if the car sits.
The lighter more volitile parts of the fuel can evaporate leaving only heavier elements behind.
David

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post #4 of 7 (permalink) Old Apr 8th, 01, 04:36 PM Thread Starter
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<BLOCKQUOTE>quote:</font><HR>Originally posted by oger:
What year is the car?

<HR></BLOCKQUOTE>69camaro

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post #5 of 7 (permalink) Old Apr 8th, 01, 04:39 PM Thread Starter
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<BLOCKQUOTE>quote:</font><HR>Originally posted by davidpozzi:
The gas cap has a pressure relief valve in it to maintain a fiew pounds pressure on the tank.

<HR></BLOCKQUOTE> Thanks Dave, sounds good. I should have searched for the topic prior to posting the question. I saw your respponse in the search and would not have posted the ? beacause you had already answered it. Thx

joe.c

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post #6 of 7 (permalink) Old Apr 8th, 01, 11:27 PM
 
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Actually, nothing shelters the fuel from oxidation if air is present. Gasoline will go bum-stale after a month or so, so make sure you use that stuff up! A $2 bottle of fuel stabilizer can be bought at your local hardware store (which treat many liters of fuel), and it will keep the fuel fresh for up to 2 years (so they say). This is what I put in my car when I go to store it, and in the spring it fires up fine. Before I used stabilizer, I would have to empty the carb of all that oxidized crud in there before it would fire.

The pressure in the tank is a positive pressure (above atmospheric pressure, in the tank) whick is good. The last thing you want is a tank whick is sealed so tight as to cause a vaccuum. Then not even Hercules' fuel pump could pull the fuel through. Seriously, if you ever think your fuel cap vent-holes are bunged, then stick the cap against the wall of the self-wash and spray the hell out of it. Minor dust can plug a caps vents easily.
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post #7 of 7 (permalink) Old Apr 9th, 01, 02:28 AM
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69's have a vented gas cap. Make sure yours hasn't been replaced with a non-vented cap.

It's probably air going into the tank not coming out. If you don't have a vented cap as the gas is used up it will create a vacuum in the tank which will draw air into the tank when you remove the cap.

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[This message has been edited by Mark C (edited 04-09-2001).]
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