 Hissing when opening gas cap, is it bad or just nothing to worry about |
 Jan 26, 2004 - 12:33 PM
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Enthusiast Joined Sep 9, '03 From Texas Currently Offline Reputation: 0 (0%)  |
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.
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Jan 28, 2004 - 1:40 PM
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Enthusiast  Joined Dec 24, '02 From Wirral, UK Currently Offline Reputation: 0 (0%) |
Basically when the car is running, it's a pressurised system - the engine is sucking the petrol from the tank. As it's a rigid construction you get a vacuum due to the small volume of air in the tank with the petrol. The hiss is just the pressure beig released.
This post has been edited by BenMMellor: Jan 28, 2004 - 1:40 PM |
Posts in this topic
pyro0694 Hissing when opening gas cap Jan 26, 2004 - 12:33 PM
PlanetFuzz mine does it too,I am positive it's fine,it sa... Jan 26, 2004 - 12:35 PM DG_Performance PlanetFuzz is right! That is normal.... you p... Jan 26, 2004 - 12:52 PM Stealths95GT release of a small amout of pressure Jan 26, 2004 - 1:08 PM pyro0694 yeah, i didn't think my friend was right, but ... Jan 26, 2004 - 1:27 PM Pandeo Your friend his right... but the incidence is not ... Jan 28, 2004 - 12:48 PM
integra_killer it's just your car farting dude!
hahaha Jan 29, 2004 - 9:38 AM |
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