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I have a 04 60 hp four stroke carbuerated yamaha. It runs great on the first run of the day, then as the day progresses it seems to be starving for gas or sucking air . I have had it in the shop twice and the mechanic takes it to the lake and checks it out. He has cleaned the carbs externally twice and re synches the carbss. when I get it back it runs great for maybe one trip ,then starts acting up again. He checked fuel pressure and says it is fine. my question is could it be the fuel pump losing pressure as the day progresses. It has the original fuel pump as far as I know. Any help would be greatly appreciated. Thanks,Fatback