Thr problem w/ ethanol fuels is when you allow it to sit for any length of time, ie lawn mowers etc, boats while stored for winter, anything that sits for a prolonged period of time. The longer it sits the more water it pulls in, and the more the ethanol settles/seperates in he tank. So when you start the motor you get a straight shot of ethanol and water, doing serious damage do to the higher concentrations of both.

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