Post by alrider on Jul 30, 2012 12:12:45 GMT -6
Had a similar issue on a 150cc GY6 engine on a dune buggy. Turned out to be a bad vacuum fuel valve/petcock. Not sure if you have a manual petcock or the vacuum fuel valve. If it is the vacuum fuel valve, unplug the line running from the valve to the fuel filter and it should only empty the fuel from the line, not continue to flow. If fuel runs out constantly with no vacuum applied to valve, valve is faulty.