Can't stay running - fuel line loses prime
So I am tuned up pretty well can really jump on it. It has a perfect puff of smoke as I ride around. The only problem is I HAVE to prime it by holding my finger over the tailpipe. I'm used to that, but it seems the lines won't stay primed. They eventually run out of the fuel in the long looped lines and she stalls out. I'm sure it means there is a vacuum leak someplace. Where should I be checking? I'm thinking where the hoses connect to the barbs and maybe the o-ring for the fuel tank lid. Anyplace else? Anyway to test the locations (like in a real car, you can spray carb cleaner on a vac line and the car will sputter)?