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					Originally Posted by John Mercier  Once again.Ethanol is a solvent.
 It dissolves varnish.
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 Ethanol is alcohol. It attracts moisture and causes phase separation in fuel and is the main reason while fuel goes bad in a much shorter time span than non ethanol laced fuel. If left untreated breakdown begins in three weeks….when breakdown occurs eventual varnishing or gumming up of components happens. 
Dan