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I did the same thing....mine ran fine at idle but when I opened the throttle, the engine started to miss and sputter..fuel starvation....I ve taken the inline plastic filter out and am installing a mounted Racor fuel/Water seperator...it has a larger "well" of fuel. The boat had one of these in the past and it was removed cause it always got in the way....but its worth the problem if I dont have to worry about water and dirt in the carbs of my Yamaha.