I started having issues with my 50 hp Yamaha on my center console as soon as they started putting ethanol in the gas. I had the engine serviced and removed all the gas. Since then every year I drain the gas and let it stand in a closed bucket for about a week. There is always some moisture and some white gritty stuff that falls to the bottom. I carefully drain off the gas and leave a small amount of contaminated fuel in the bottom of the bucket. This is easily disposed of in a bon fire or if your patient it will evaporate. I pour the separated fuel back in the boat and top off with fresh fuel.
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