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#62623
"Engines built before the mid-1980s are more likely to experience trouble.
Alcohol can cause numerous problems, including deterioration, swelling and hardening of rubber components like fuel hoses, carburetor seals and gaskets, and fuel pump seals. This may lead to fuel leaks.
Also, ethanol absorbs water more readily. This can be a problem for equipment that sits idle for extended periods of time.
Ethanol also can dissolve the lining of fiberglass fuel tanks. The resulting dark sludge can cause engine damage, and the tanks can leak fuel."