monkeytree
New Member
Hi,
I was gifted an 051av that has sat forever. Fuel line was melted to black goo amongst the thick varnish residue of the old gas left long since evaporated from tank. Cleaned it with acetone and (unfortunately, as it ate the paint in the tank which created more work) as it was the only thing I could get my hands on that would touch the gooey mess. New tank lift line and filter and fuel line from tank to carb, carb kit. She flashes right up and seems to run fine.
Problem is, it aggressively spews fuel out of the fuel cap where the vent hole is (directly in the centre of cap, about 1.5 mm diameter ) as I bring the revs up, spraying me with fuel. Looking at Stihl schematics my cap seems to differ from the ones shown, in that it is simply a hole straight into the fuel cap from the top. There is no other venting into the tank, only the hole in the cap.
Putting a set/self tapping screw into the hole in cap I don't think would work as the tank won't vent properly (unless it self pressurizes?). Does anyone have a trick for simple check valve to set into the hole in cap to help keep the fuel in? Or have I screwed up on the carb kit and the check valves in the carb aren't doing their job? Remember these saws fuel tanks are completely separate from the crankcase so its unlikely it is a crankcase leak into the fuel cell. Pressurization has to be coming through the carb.
Thanks
I was gifted an 051av that has sat forever. Fuel line was melted to black goo amongst the thick varnish residue of the old gas left long since evaporated from tank. Cleaned it with acetone and (unfortunately, as it ate the paint in the tank which created more work) as it was the only thing I could get my hands on that would touch the gooey mess. New tank lift line and filter and fuel line from tank to carb, carb kit. She flashes right up and seems to run fine.
Problem is, it aggressively spews fuel out of the fuel cap where the vent hole is (directly in the centre of cap, about 1.5 mm diameter ) as I bring the revs up, spraying me with fuel. Looking at Stihl schematics my cap seems to differ from the ones shown, in that it is simply a hole straight into the fuel cap from the top. There is no other venting into the tank, only the hole in the cap.
Putting a set/self tapping screw into the hole in cap I don't think would work as the tank won't vent properly (unless it self pressurizes?). Does anyone have a trick for simple check valve to set into the hole in cap to help keep the fuel in? Or have I screwed up on the carb kit and the check valves in the carb aren't doing their job? Remember these saws fuel tanks are completely separate from the crankcase so its unlikely it is a crankcase leak into the fuel cell. Pressurization has to be coming through the carb.
Thanks
