Chainsaw Gas Cap Vent Leaking

If the vent hole is broken ripped open or clogged the gas may leak in other areas.

Chainsaw gas cap vent leaking.

Any help would be appreciated. I have a stihl chainsaw 028 that just fills up with fuel. Replace the fuel lines if they re leaking. Replace the cap and see if it is still leaking.

If even a single thread becomes cracked or chipped it can cause fuel to leak out. When the gas inside your stihl chain saw fuel tank heats up it creates pressure inside the tank. The vent hole gets rid of heated gasses so it may be broken. Take spark plug out and pull rope and fuel shoots out of exhaust and spark plug hole.

For the carburetor to work these pressures must be equal. Replace the fuel tank cap if its seal is damaged and leaking. Inspect the top of the gas cap and look for cracks but also inspect the threads on the underside of the cap. Still does it just sitting there.

Thought it might be tank vent. Cleaned it out good. Check the fuel tank and replace the tank if it s damaged. Fuel lines are good.

If the tank can t vent this added pressure fuel will stop flowing from the tank to the carburetor due to an imbalance in the atmospheric pressure and the tank pressure. If fuel leaks from the carburetor rebuild or replace the carburetor to prevent gas from leaking.