I replaced all the fuel lines in the tank and to the engine. I used medium fuel tubing. I pressurized the tank, it's held pressure,Replaced the muffler with another Slimline Pitts W/ smoke. Blocked off the smoke port. Primed the engine, it ran until it ran out of the prime. This is a brand new engine, and why will it not run? The Low end Idle disk is at thenutral notch, havn't touched it since replacing all the tubing. I ddi try to lean the low end, same problem, the richened the Low speed again, same problem.. I even put clamps on the tubing.. This is very frustrating tosay the least.The disk looks fine ,not loose,So now what?