running rough, clogged gas tank vent?
#1
running rough, clogged gas tank vent?
my car has been running rough lately, but i noticed that every time i fill the car completely up with gas, it runs much much better. and also when i unscrew the gascap there is a loud and long hissing noise. my dad told me it might be a clogged gas tank vent. could that be so? and if so, would that cause the car to get leaner and leaner as the tank emptied? thanks to all in advance.
PS- i always fill uponce i get to 1/2 tank.
PS- i always fill uponce i get to 1/2 tank.
#6
RE: running rough, clogged gas tank vent?
What I was trying to say is that the gas cap is only vented one way. It is vented to let air in the tank as thegasoline is used up. It is not vented to let the gasoline fumes out of the tank, that is the job of the EVAP system. As the fuel in the tank evaporates it builds up pressure. This causes a hissing noisewhen the gas cap is removed and the pressurized fumes escape. Lessfuelin the tank, the more roomis available forpressurized fumes to collect, so an empty tank will hiss more than a full one, depending on how recently the EVAP purged the fumes.
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White1992Z28
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06-11-2012 04:59 PM