What issues are caused by ethanols hygroscopic properties?
Ethanol molecules have a stronger bond to water molecules than to gasoline molecules. In the absence of water, ethanol and gasoline molecules will bond. However, when water is added to E10 fuels, the bond between the ethanol and the gasoline will weaken. When the percentage of water in E10 fuel eceeds .5% the bond between the ethanol and gasoline will break down resulting in phase seperation. Ethanol will continue attracting water at this point up to the amount of Ethanol in the fuel (10%).
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