Fuel Cap Pressure

[Fenner408]

When ever I open my fuel cap to fill up it hisses. Im not sure if its pressure or vacuum. I dont remember my 08 doin it, but Ive been noticing it alot lately. I havent been able to tell any performance loss, but Ive been in fuel conservation mode lately. What do you guys think?

 

[tensixniner]

What is fuel conservation mode and how do you know your in it?

Never heard noise from my cap other than the click click click when I tighten it.

 

[Fenner408]

What is fuel conservation mode and how do you know your in it?

Never heard noise from my cap other than the click click click when I tighten it.

There isn't an actual conservation mode. I just mean I'm not beating on it as much as usual.

 

[Fenner408]

No one has this? Maybe I need a new cap.

 

[SEABEE08FX4]

If its vacuum then your vent tube may be clogged up, shouldn't be any pressure though like you would see in a gas rig.

 

[tbsimmons]

Vent is at the top of the tank. It is a little cap looking thing.
You can see it if you stick your head between the frame and fender.

 

[Fenner408]

I'll check that. It would make sense because I've been driving a lot of gravel.