whoosh noise..
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Joined: Apr 2005
Posts: 107
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From: SO. CALIFORNIA
Car: 1991 RS
Engine: 305 TBI
Transmission: AUTO
Axle/Gears: 2.73
whoosh noise..
When I take the gas cap off my car it makes a "whoosh" noise, like the tank is in a vaccum..Do I have a plugged or not working vent or something??
Supreme Member
Joined: Jul 1999
Posts: 18,457
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
No.
It is supposed to do that.
In fact, most newer cars, will set a trouble code if pressure fails to build up.
That's what the gas cap pressure test during your emissions inspection verifies.
It is supposed to do that.
In fact, most newer cars, will set a trouble code if pressure fails to build up.
That's what the gas cap pressure test during your emissions inspection verifies.
Supreme Member
Joined: Jul 2001
Posts: 3,931
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From: Palm Bay, Florida, USA
Car: 95 E-150 & 07 Kawasaki ZX-6R
Engine: A slow one & a fast one
Transmission: A bad one & a good one
Axle/Gears: A weak one & a chained one
Yep. The pressure is maintained so the EVAP system works. If there's no pressure, then it's obviously venting to atmosphere somewhere, which defeats the purpose of EVAP and creates unnecessary emissions..
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