pressure in fuel tank

[Spatt]

Every time I fill up. when I open the fuel filler cap I get a hiss from the tank. I assume this is normal? Wanted to check

[Ekona]

Perfectly normal.

[Lexx]

As Dan says, perfectly normal. Every car in my household does that.

[SkylineV35]

lol glad thats cleared up! mine hisses like somethins gonna blow

[Spatt]

Cheers guys

[richmillions]

Mine does it and other cars have also. Anyone know why the pressure build up?

[ilogikal1]

It's to reduce fuel vapour emissions (along with carbon canisters). Most vehicles now run the tank at a negative pressure stop fuel vapour venting to atmosphere since the regulations were changed in 1998 (ish... I think).

[richmillions]

It's to reduce fuel vapour emissions (along with carbon canisters). Most vehicles now run the tank at a negative pressure stop fuel vapour venting to atmosphere since the regulations were changed in 1998 (ish... I think).

 

Every day is a school day

[Dblock]

It's to reduce fuel vapour emissions (along with carbon canisters). Most vehicles now run the tank at a negative pressure stop fuel vapour venting to atmosphere since the regulations were changed in 1998 (ish... I think).

 

Good knowledge

[Stutopia]

It's to reduce fuel vapour emissions (along with carbon canisters). Most vehicles now run the tank at a negative pressure stop fuel vapour venting to atmosphere since the regulations were changed in 1998 (ish... I think).

 

That's interesting. I'd always just assumed it was because 70 odd litres of fuel had been sucked up and there's no air getting in to replace the liquid, until you open the filler cap that is, and it rushes in.

 

Top post

[ilogikal1]

Yay, I contributed something useful for a change.

 

 

 

 

 

 

Normal service will now be resumed.