stihl 078av fuel cap

[Aicchalmers]

Hi, the fuel cap on my 078 is leaking, out of the central hole in the top of the plug, the threads seal fine. It bubbles out under slight pressure after using and leaks if left on its side.

Is this designed as a pressure release valve or can I just glue it up?

Anybody know where to get spares from to just replace it?

[wisecobandit]

Theres a little ball bearing type ball in them that sticks up. Sometimes you can just free them up bya squirt of oil gently sticking a needle or pin in the hole just to get it moving again. You don't want to seal it up as it acts as the tank breather.

They aren't to expensive to replace the cap tho.