Funny you should ask that question. I just now got done prepping my '80 Puch for long term storage, and the tank was almost full of 3+ month old gas. I just pulled the fuel line off the carb, turned the petcock on, and let it drain out on the ground. After I put the moped away in the storage shed, I took a water hose, and sprayed water on the area where I let the gas drain. It is my property after all.