First it was my 385 leaking out the fuel tank vent. I replaced the white tube part tha goes into the tank. The new one didnt fit tight and still leaked. So I put 2 small Orings on the tube and put it back into the tank. No more leaks. But It went from one saw to another. Now my 346 NE is leaking out the tank vent. My stihls havent ever leaked out the tank vent. But my older 066s have leaked from the fuel cap. Never mind me I just venting.