Try the Stabil Marine formula
STA-BIL 22239 "MARINE" FORMULA 8-OZ, • BEST Ethanol Problem Fighter • Extra Corrosion Protection & Fuel System Cleaning • For Optimal, Everyday Performance & Protection • Recommended to be used at Every Fill Up, Not Just for Seasonal Storage • DOUBLE the Corrosion Preventers in Regular STA-BIL • Over FOUR TIMES the Fuel System Cleaner in Regular STA-BIL • Use in ALL 2 & 4-cycle marine engines, in gasoline, gasoline/oil mixtures and ethanol blends • Also safe to use in ALL stored or infrequently driven collector cars, motorhomes, tractors, snowmobiles, motorcycles, lawnmowers and ALL outdoor power equipment. • One bottle treats up to 80 Gallons for regular everyday usage, STA-BIL recommends for fuel "clean-up" to double the dosage.