Re: 1957 Evinrude Fastwin 18hp Carb Problems after rebuild Home › Forum › Ask A Member › 1957 Evinrude Fastwin 18hp Carb Problems after rebuild › Re: 1957 Evinrude Fastwin 18hp Carb Problems after rebuild ChrisReplies: 29Topics: 3 March 15, 2018 at 5:48 pm #72526 I’ve also seen a main gasket (that goes between the 2 halves of the carb body) get swollen. Some would suggest that being from the Non-ethanol free gas. The gasket swelled up and was preventing the float from going all the way up, and would flood.