No Hissing sound when opening the gas cap

Does your Tundra make a whooshing or hissing sound when you open the gas cap?
My 97 Tacoma does that (very long whooshing sound most of the time) and just curious if other Tundra's do it or not. Mine doesn't! I have another old car that makes the same sound.
The car runs great but I like to find non-existing problems

Thanks

 

Yup... It's not supposed to... That's what the evap system is for

 

like there is pressure or vacuum in there and when u open the cap it makes a long hissing sound ...
I have 2 other cars that do make that sound every time I am getting gas and i am used to it so I maybe comparing new technology with older cars.

ok thanks, I just saw the evap system post.

 

Don't over fill the tank either.

 

Mine does. If I get close enough, I think it's saying "thirsssssssty".

 

LOL @COMiamiFan

 

do you mean leave some room for air? is it bad to fill it to the rim?

 

Yep, pull the filler nozzle and quit the first time it clicks off.

 

If you go beyond the first click, there's a chance that when the fuel expands, it will flood the evaporation system with raw fuel and cause issues. The system is designed for fuel vapor and not liquid fuel. What sorts of issues may occur, I'm not sure, but maybe someone who has had them or understands it better can share.

 

I'll try to check mine today when I fuel for my early run to Denver tommorow. Data gathering.