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> Hissing when opening gas cap, is it bad or just nothing to worry about
post Jan 26, 2004 - 12:33 PM
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pyro0694

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Joined Sep 9, '03
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whenever i take my gas can off to fill my car up with gas, i always notice a hissing sound when i screw it off. like its under pressure. i didn't really think anything of it until it was brought up by a friend who said the same thing happens to him. he said that he thinks its unusual and is bad for the car, since the fuel pump is having to deal with the pressure in the tank, consequently reducing gas mileage. i was just wondering if he was right or if it is just nothing to worry about. thanks. biggrin.gif

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