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Are you referring MTBE or the E-10 ethanol being used now? Damaged engines caused by dissolved gunk from fueling with ethanol-10 (10-percent alcohol) gasoline, clogged filters and dissolving fiberglass fuel tanks are really affecting the boating industry and I would visit a large marina for some “real world” advice. The marina may have some advice about sealers. I have heard about people sealing their fiberglass motorcycle tanks, maybe the Caswell or the POR 15 people have a suggestion.
It is my understanding that boat manufacturers (post 1980) have switched to ethanol-proof tanks, filters and fuel lines and newer fiberglass fuel tanks made of vinyl ester resins are not damaged by ethanol.
Since we are only talking about a few gallons on a bike I would recommend draining the tanks at the end of the season. This will also prevent the idle circuit from being blocked with dried fuel. Fuel storage can be a problem and to prevent condensation that can cause engine problems or phase separation of the gas, boaters recommend filling tanks 95-percent full and adding a fuel stabilizer. If phase separation does occur with the E-10 gas and excessive water separating, get rid of that tank of gas — not just the water in the bottom. The water will stop or damage the engine. Remaining gas becomes a low-grade, low-octane gasoline, leading to engine damage or inefficiency.
Hope this helps
Dave
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