It's not just rubber that needs changing. Aluminum will be corroded just not at the fast rate rubber does. Metals treated with magnessium become vulnerable. The biggest problem lies in the fact ethanol[and almost all other grain alcohols] will carry a charge. The potential is a ruptured line, wherein the fuel is carrying a charge from the pump or other source[return trip], finds a ground and arcs the current.
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:soapbox:
++-----I said don't! Please? OK fine ------------------++
Personally I would never do it until the country gets itself out of the pockets of lobbyists. ADM spend tons, and I mean tons of cash to keep corn making money for them. Corn is actually one of the worst crops for grain alcohol[yield and field value wise]. Ironically what ADM made billions on was saving the sugar crisis[that hasn't been a crisis for decades, viva la corn syrup], and that cane is one of the best ways to produce grain alcohol.
Now a better approach is upping the E10[10%] to 20-25% across the board, adding a much smaller amount of lead than the good old fuel and getting rid of the use of MTBE. The lead is a great lubricant and coater and would help carry the extra ethenol with almost no modifications.
++------curiosity got you huh! Dang that cat :crazy: ---------++