Air hissing sound when removing gas cap

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Apr 19, 2003 | 06:59 PM

chris j vurnis

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Air hissing sound when removing gas cap

When I remove the gas cap at a fill-up, I always hear a noticeable hissing sound of air rushing in (or fumes rushing out) of the tank.

Is this normal?

Apr 19, 2003 | 07:02 PM

Jime

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Re: Air hissing sound when removing gas cap

Quote:

Originally posted by chris j vurnis
When I remove the gas cap at a fill-up, I always hear a noticeable hissing sound of air rushing in (or fumes rushing out) of the tank.

Is this normal?

Yes, your tank is pressurized.

Apr 19, 2003 | 07:40 PM

gtr_rider

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Its normal.

Apr 19, 2003 | 07:46 PM

Jamsan

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Your car's about to explode....

Apr 19, 2003 | 08:54 PM

waveridr85

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i was thiking about this, if there is a vaccuum in your tank wouldnt it cause the fuel pump to work harder as the vaccuum increases, so basically wouldnt the greater the vaccuum mean the less horsepower?

Apr 19, 2003 | 08:59 PM

silver99

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Quote:

Originally posted by waveridr85
i was thiking about this, if there is a vaccuum in your tank wouldnt it cause the fuel pump to work harder as the vaccuum increases, so basically wouldnt the greater the vaccuum mean the less horsepower?

no, the fuel pump is submerged in fuel not air.