My '92 40hp Johnson gave me a fit also untill i started at the tank and replaced all the old rubber lines and parts with some that could handle ethanol rebuilt carbs 4 times in the process, fuel pump once, the last thing giving me the fit was the enricher. Two years and no further trouble, also changed from 'cheap' gas to Chevron or Shell. Hope you find a good mech and rid of the awful time.--shu