I was getting gas the other day and noticed my gas cap hissing when I opened it. For the 2 yrs I had the car it never did that. I get a CEL 32 and from reading old post. I figured my roll over valve was busted. Does anybody have any idea why its doing this now?:wary

were you almost out of gas? usually when your gas tank gets low and there is a lot of emptyspace in your tank, the gas will evaporate. when you open the cap, you are venting the vapors out of the tank, creating the hissing sound.

I always fill up when I'm almost out of gas, and it never did it before. I'll wait and see what happens next fill up, which will be awhile because I don't drive a lot now, damn gas prices.

mine does the same thing its no biggie. Then again I've always gotten 300 MPtank and I heard people getting like 400! Hmm... but I'm sure it's nothing. If you really paranoid, buy a new cap and try it and if it hisses when you fuel up again then I wouldn't worry. Lemme know haha....

actually i thought its suppose to hiss, that way you know its actually working? if it doesnt then you have a prob? isnt it one of the things the cali smog techs have to look at?

Mine has never hissed in the year I have owned it. And I am one of those people that get almost 400 to the tank(highway)..ha ha... 118k on the thing too.

I know mine hisses I'm just not sure how often...I think I read somewhere the hiss is good....it means you have compression or something like that.


98 Eclipse GS:
Greddy Evo
RH z5000 19's
Blitz Kit
AEM CAI