Since I rebuilt my fuel system (and everything else) in this century, I don't mind putting ethanol in it. Never been a problem, unless I let it sit for several months. If I do, the floats will stick to the bottom of the bowls. In that case, I run the fuel pump for ~10 seconds, shut it off, and then go check fluid levels. By the time I'm through with that, the fuel has dissolved the varnish and the floats have floated again and I'm good to go.