Problems ethanol causes in vintage cars?

I can tell you first hand that my gas ride on Ditch Witch trencher experiences all kinds of problem with ethanol gas. I bought new Gates fule injection rubber fuel line a new AirTex electric fuel pump. I ran the trencher with plain gas all last year and up to a couple weeks ago and had no issues. I was in a hurry so I bought ethanol gas and ran the trencher. Let it set for three days and went to use it again then it wouldn't start. Took fuel line off a the carb and nada. Pulled the fule line from the tank it it was swelled and rubbery. Pulled the fuel pump and it ran but wouldn't pump gas. New fuel pump, new lines and it was running again. Next day the carb float hung and it would let gas in the bowl. Tore it down to find the float valve needle rubber had turned to a thick jelly also and had stuck shut. I rebuilt this carb two years ago and it has preformed without a hiccup until the ethanol gas. Luckily I had a spare float needle so I installed it after soaking the carb down in real gas. When I put it back together I have had no more problems with real gas. After seeing what ethanol did to the Gates fuel injected hose I will never run it in anything that has rubber fuel lines.

Also I recall a member posting that he had replaced all the hoses under his car and that included the fuel tank hose. He went to the garage to find gas under his gas tank and his hose also turned to jelly then started leaking.