Yamaha Outboard FAQs

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Question

What issues are caused by ethanol’s attraction to water?

Answer

Ethanol molecules have a stronger bond to water molecules than to gasoline molecules. In the absence of water, ethanol and gasoline molecules will bond. When water is added to E10 fuel, the bond between the ethanol and gasoline will weaken. When the percentage of water in E10 fuel reaches approximately 0.5%, the bond between the ethanol and gasoline molecules will breakdown and the ethanol mol¬ecules will attach to the water molecules. This is called phase separation.

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