I've had to rebuild two carburetors because of using gas with ethanol. The gas had a fuel stabilizer in it with an ethanol treatment. After that, I gave up on gas with ethanol in it. There is no gas station locally to buy ethanol-free gas, so I buy either Torco or VP ethanol-free gas from an auto performance store The gas is expensive, but the equipment always works and I don't have to worry about leaving gas in the equipment.