Wouldn’t the cleaning properties of ethanol be good for a fuel system?

No, fuel systems that have been used for non-oxygenated fuel will have varnish deposits and surface corrosion (rust and aluminium oxides). This includes the tanks and pipes used for fuel storage and transportation. Ethanol will clean varnish as well as surface corrosion from any surface it contacts. Ethanol may dissolve plastic resins used to make some fibreglass tanks. The amount of material cleaned from all of these systems can quickly exceed the filtration capacity of fuel system filters resulting in restricted fuel flow. Ultimately engine performance is reduced and potentially damage to the engine can occur.

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