I know this is a few years late, but that carb will only work on propane. HD5 grade. And if you are still having to prime it with gas to get it started is because you have a vacuum leak.(_ most likely the throttle shaft on the carb. Everybody puts too heavy of a return spring. A lot of the old mech's are gone to show you how to set up that governor.) The engine has to draw the fuel in from the LPG reg.