Fuel Management Problem?

[92Squiggy]

I've noticed on my last few fill-ups that whenever I open up the gas tank door and begin to twist off the gas cap, that there is a steady "hissing" sound the eminates from it until it is fully opened. Is this normal or signs of something that needs to be replaced? I've never noticed this happening on my Dad's 98 I4 LE or my Moms 03 Ford Escape V6 or my Brothers Acura 01 3.2CL...

Any help would be appreciated.

[chronoti]

odd, i never noticed it on my mother inlaw escape, but all my other cars do it

mk3 supra
gen 3.5 cam
gen 5 cam
87 4runner
tch
01 silverado
95 northstar

[JohnGD]

Maybe your fuel pump is running warmer than others? (All other things being the same).

Originally Posted by 92Squiggy

I've noticed on my last few fill-ups that whenever I open up the gas tank door and begin to twist off the gas cap, that there is a steady "hissing" sound the eminates from it until it is fully opened. Is this normal or signs of something that needs to be replaced? I've never noticed this happening on my Dad's 98 I4 LE or my Moms 03 Ford Escape V6 or my Brothers Acura 01 3.2CL...

Any help would be appreciated.

[arlo]

The sound is just gasoline vapors leaving your tank. You probably hear it more on a near-empty tank since there is more space above the liquid for vapor to form.

[92Squiggy]

Originally Posted by arlo

The sound is just gasoline vapors leaving your tank. You probably hear it more on a near-empty tank since there is more space above the liquid for vapor to form.

I suppose this response makes the most sense. I usually run the tank to like 1-2 gallons left in the warm months. But it still has been doing it even though Ive been filling up @ a 1/4 tank for the cold months.

[arlo]

It does it now because during the cold months, we (refiners) add more volatile components that vaporize easier in lower temperatures.

[bigbird]

my tanks have always done that. i never really noticed if it did it in a pattern. always seemed to do it though after a long highway drive.

[92Squiggy]

hmmm maybe its just they way these cars are naturally. Bugs the hell outta me though. I alwasy am thinking I need to replace a fuel pump/filter/line/charcoal canister....

[#2!]

I thought it was suppose to do that and if it didn't then the cap seal is warn. All of the cars I have had does it.