Not to labor the point, but if Ethenol/alcohol doesn't cause any problems why has Walbro come out in their rebuilt kits with a new material for the diaphrams? When I emailed their engineering department this is chart they e-mailed back.
Please note the one's they recommend for alcohol
Please also note the rubber disphram is not recommened for alcohol
all Walbro carb's pump diaphrams used prior to ethenol were made from rubber.

Also Fuji and Zenoah engine manuals state" do not use fuel containing alcohol".
Just to be sure we go to the boat harbor with our 5 gal cans and buy "gas"