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What is phase separation?

April 26, 2017phase Separation

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What is phase separation?

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When a 10% ethanol blend is contaminated with over .5% water, the ethanol and water mixture will separate from the gasoline and fall to the bottom of the gas tank. This is an inconvenience, because the fuel system must then be drained and new fuel added. Before using ethanol-blended fuel for the first time in an older small engine, it is recommended that all water be removed from the tank. Since many outboard motor carburetor problems result from water in the fuel system, continuous use of an ethanol blend can prevent water accumulation and unnecessary maintenance.