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If it contains ethanol, as the vast majority of gasoline sold in the U.S.A. does, you must drain it to prevent deterioration of the fuel lines, pump, and other plastic/rubber parts. As a rule of thumb, drain it every time you store it if it's pure gasoline or blended with ethanol. Five years from now when you need it to be dependable, you'll be the guy whose generator started while your neighbor was scrambling to find parts before the storm, camping vacation, or flood waters came.
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