I'm putting this here because I will probably get better results.Gave my next door neighbor a 1968 ? 20 hp Chrysler and a omc tank and hose.Motor is rigged for omc tanks.He said motor ran great as long as you pumped the bulb.Some guy told him its the fuel pump,but I'm more concerned its the fuel hose bulb as with a different tank and hose it was running fine in the barrel.I believe its a faulty check valve in the bulb.