We have a 63 MG Midget. It sits up in Babylon for our yearly visit from the islands. Once it sat for at least 2 years, maybe 3. We charged the battery, turned the key, waited for the SU's to prime, pulled the starter switch and off it went. Then smelled petrol and shut her off. Discovered the flexible (made in USA) fuel lines had turned into sprinklers. Changed the hose, fired it back up again and went on our way. Never smelled the gas in the tank directly so did no worry about it. So much for modern gas being the devil's best friend. Even if ethanol is in the gas, how bad can it be. We make our coffee with the stuff down here.

Seriously, dilution is probably best for the OP's situation, or as stated, a tow rope. If the tank is really bad, just replace it.