Can You Identify This Part?

[mhyphenl 10 1 Cars]

Can you identify this?

 

 

You can suck on the top, as you see it, quite hard and it lets air through but you can't blow so it must be some kind of one way pressure release or non return valve. Also works if you blow in at the bottom left but again quite hard!?

 

Any Ideas, seen one anywhere in your car??

[PhilNW 44]

Fuel tank breather?

[petert 589]

Isn't that from the side of a 306 tank?

[farmer 328 1 Cars]

Looks to me as had a new one out yesterday the fuel tank venting valve

[mhyphenl 10 1 Cars]

Hi Farmer, I thought you might say that! Is it the same one I'm looking at to get from you? What I find odd is that the air flow seems to be the wrong way round to me!? You can only suck on it so that would mean only letting air in! Obviously you could pop a pipe on the bigger end, (effectively blowing through it rather than sucking). It does take a fair bit of puff to activate it. Can you have a look at my other post re the fumes in the car as I have some more info / questions!

[toolie72 67 1 Cars]

Letting air into tank to replace petrol you've used? Wouldn't be needed when refuelling as you have fuel cap off

[hoodygoodwood 71 3 Cars]

That is the fuel tank breather , it is connected to the tank by several feet of stiff black tube which comes out of the top of the plastic fuel tank and is normally clipped to the underside of the boot floor . I think it lets air in one way only so as the fuel tank level drops you do not get a vacuum .I have the same thing on my 309 GTI's

[mhyphenl 10 1 Cars]

Ok, so if that is so, should the filler cap be sealed?? I don't think mine is. I have a phase 2 with EVAP system so my tank breather goes to the carbon canister which sucks vapours out of the tank and in to the throttle body through the carbon canister. meaning its working in reverse to what you are saying. There must be a difference in the filler cap between phase 1 and 2!?

[Juttie205 123 2 Cars]

Not allways mounted up near filler cap mine sits near rear bumper.