Gas cap WOOOSH...
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Joined: Apr 2004
Posts: 75
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From: Worcester MA
Gas cap WOOOSH...
It was the same on my former '89 corvette, so I never thought much of it. One of the other threads mentioned replacing a vent valve near the charcoal canister and getting rid of the WOOSH. Should I be concerned?? Is this normal???
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
It's only normal when the car is left sitting and the temperature changes.
When you drive, the vapor purge system dumpes those fumes into the intake. It's to prevent them from escaping to atmosphere. Smog deal.
When you drive, the vapor purge system dumpes those fumes into the intake. It's to prevent them from escaping to atmosphere. Smog deal.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
If it's purging at the tank valve in the engine compartment, you need to replace that valve. It's there to keep the fumes (and the whoosh so to speak) in the tank until vacuum is applied which allows the fumes to flow into the canister and then into the engine upon certain throttle conditions. Gas fumes in the engine compartment are never good.
Race Director
Joined: Jul 2004
Posts: 16,795
Likes: 62
From: Lake Havasu City, AZ
It has been unusually hot here in Michigan this summer. This weekend it was over 90 and my tank was down to about 1/8. The woosh was very noticeable on re-fueling....
It usually isn't that noticeable, but a low fuesl level combined with sitting in the hot sun vaporizes the gas and increases pressure
It usually isn't that noticeable, but a low fuesl level combined with sitting in the hot sun vaporizes the gas and increases pressure
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A low tank means more vapors, means more to expand in the heat. Remeber, the empty part of your tank is all fumes.