What do you put in the fuel tank when you park it for storage??? I've always had very good luck using Sta-Bil in the gas when it's gonna be parked for awhile! With only 10% ethanol, doubt it's causing the problem...it's just the low quality fuel, doesn't even matter where you buy it.. We run E-90 in a couple drag cars, when we store them for the winter we put a couple gallons of Av Gas with Sta-Bil in it and run the car long enough to work it through the carb before we shut it down.