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Air coming from filler neck

Hairyarse

Hairyarse

New member
This maybe a daft question but when I unscrew the fuel filler cap there's a large rush of air coming out the filler neck. I've had it the odd time on other cars but it seems to happen every time on the 944. Is this anything to worry about?
 
Its more likely to be air rushing in.

I think its because the fuel pump creates a small vacuum which sucks air in when you open the cap.

It may mean your vent pipe is blocked.
 
Cheers guys. I wasn't too worried but thought I had heard recently that it could be the sign of a problem.
 
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