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Drain fuel/water filter. Run engine directly off a 6gal. tank with fresh fuel thru the Racor fuel/water separator. Should'nt be any water in filter. If this solves problem then check your fuel tank. I have a 1989 C-Hawk w/90 hp Yami. Had gas/water in filter(Racor). Engine would sputter. Get it to plane and problem would smooth out until water built up again in filter. I changed filter, gas lines ,hose fittings, tweeked carbs.etc. No luck. Because my deck was a little spongy, I decided to rip it out. Upon inspection of the foamed in place 50gal tank, I discovered 3 holes in tank caused by corrosion. Emptied about 5gallons of water from tank. Foam was saturated with water and gas. Will be installing new plastic 36gal tank(no foam), a new stringer and new deck this spring. Hope this helps you. TK
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