swordfish Posted September 14, 2006 Share Posted September 14, 2006 hi guys someone said you should get a release of pressure when u remove the fuel filler cap? is this correct? have recently had fuel consumption go up 30% any ideas? Quote Link to comment Share on other sites More sharing options...
blake918 Posted September 14, 2006 Share Posted September 14, 2006 Sometimes mine wooshes, and sometimes it doesn't. I haven't noticed a pattern for when it does it and when it doesn't. I get great fuel economy and my car is fast regardless of the woosh, so I guess it does not matter. ;) As for the greater fuel consumption start with some of the basics, check/replace the following: air filter, tire pressure, ignition system, fuel filter, etc. And, above all, no jack-rabbit starts and use the cruise control as much as possible on the freeways. Quote Link to comment Share on other sites More sharing options...
jc19907 Posted September 14, 2006 Share Posted September 14, 2006 When the tank is heated (due to outside air temp variation), the air left inside it will expand causing the pressure to increase in the tank. Quote Link to comment Share on other sites More sharing options...
MrPink Posted September 14, 2006 Share Posted September 14, 2006 I've had my LS for a few weeks now and it makes the same sound. Quote Link to comment Share on other sites More sharing options...
SW03ES Posted September 15, 2006 Share Posted September 15, 2006 It will woosh sometimes and sometimes it won't depending on the temps like JC said. The idea behind the "it should woosh" notion is that if the seal in the gas cap goes bad (which happens over time) you will see a loss in tank backpressure which can cause reduced economy and preformance. If your state has inspections or emissions testing they check the cap then. Quote Link to comment Share on other sites More sharing options...
05silverls430 Posted September 16, 2006 Share Posted September 16, 2006 Yea, mine only seems to "whoosh" when it's hot outside. I've noticed it on all of my cars, and I'm pretty sure it has to do with the outside temp. Quote Link to comment Share on other sites More sharing options...
lexus082 Posted September 16, 2006 Share Posted September 16, 2006 I just replaced my entire gas cap with a new Lexus cap and that sound you described is sometimes there and sometimes not there. So I would say it is normal. But I would also recommend to everyone (Like the Toyota/Lexus recommends to replace the gas cap gasket. With gas prices so high you don't want any of your gas to evaporate into the air. I think Lexus recommends every 10 years or so to replace. I just purchased a new cap that has the new gasket installed on it. It was only a few bucks more for a whole new cap. Quote Link to comment Share on other sites More sharing options...
swordfish Posted September 17, 2006 Author Share Posted September 17, 2006 thanks guys, i will get a new cap. Quote Link to comment Share on other sites More sharing options...
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