Ethanol is a powerful solvent and that will dissolve fiberglass fuel tanks. Not only does ethanol react with fuel tanks, it also reacts with fuel filters and carburetors.
Ethanol is an excellent cleaner, but at the levels found in E10 gas, it acts as a solvent that cleans sludge while dissolving polymers. This can certainly stop your marine engine.
Ethanol is hygroscopic, which is a scientific term for attracting water. Water from condensation often forms in the fuel tanks of boats. The ethanol attracts and absorbs the condensation. When this occurs, a boat engine may stop working due to water contamination or fuel phase separation.
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