In mid 2009 I used about 50gal worth of regular gas with 10% ethanol, before shutting down the airplane for installing the rotary engine. When I started fueling the airplane this week for the first ground run with the single rotor, every fuel system part I did not replace leaked. The parts were drain valves in both tanks and the fuel shut off valve. Earlier, I also found deteriorated fuel cap seals, resulting in new fuel caps. Now every seal and hose in the fuel system is new. All that after flying for 9 years with ethanol free gas without a leaking problem.
It turns out that it is the same pattern I have been encountering on my yard equipment every spring. There is always some non metal part in the carbs that need to be replaced.
I am fortunate to have found a gas station about 30Mi from here selling ethanol free regular. There seems to be a tendency that gas stations are switching to premium gas ethanol free.  If you want ethanol free gas you have to pay more.

FWIW.


Richard Sohn
N2071U
www.fairpoint.net/~res12/home.html

I had a leaking O ring around one injector.

Paul Lamar