Took fuel tank out and checked clunk and for air leaks and all is well. It is a touch lower than the remote needle valve but close, short fuel line from tank to valve. Everything is new except the engine which was prurchased used but in good shape. I did not know if maybe I had the vavle settings screwed up especialy the idle. Can you lose pressure from the exhaust that would let the fuel run back into the tank? Sometimes I have to cover the exhaust to build pressure tokeep fuel in the carb to get it started.
Jamie