On the QD, make sure the gas cap is tight, to allow pressure to build in the tank, as has been said. What I don’t think has been said yet, is that the pressure for the tank is developed by engine crank case pulses that are built by the use of rubber check valves in the intake manifold area. Once in awhile, you see those rubber valves deteriorate and not seal; so pressure can’t build up….
Long live American manufacturing!
