Jerry, I have had the original fuel pump from my scooter in my hand, and had it apart. The problem has nothing to do with ethanol, or any other fuel. It's a clearance issue between the impeller and the pump housing. Please quit talking out of your anus. When the first 2009's had trouble we were told the replacement pumps were of a new design, yet they had the same part number (no revision number). My replacement pump failed the next summer (same symptoms; pump failure when hot, ran fine below 90ºF ambient), which is why I replaced it with an aftermarket pump from a different supplier. I hope that Yamaha remedies the problem in a more permanant fashion then they did in 2010.