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As I understand it, all plastic/nylon tanks can be affected. With E95 fuel, while the ethanol stays in suspension within the petrol, you're pretty safe. It's when the ethanol separates out that the problems occur. How long this takes will depend on how quickly the fuel absorbs moisture.
Metal tanks aren't immune either as the ethanol is acidic and contains its own oxygen, so corrosion can occur more readily.
Certainly over winter, it's safest to keep ethanol free fuel in your tank if you're not using a fuel stabiliser.
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