My Dad did it by putting the thing in, then going in the store and letting the thing click off by itself. He would pay, then just walk back to the car get in and drive off. If I remember right, the fill tube was on the passenger side, just like the pic. The place he stopped for gas and coffee, put the fill tube on the other side of the car from the store. He did it about 3 times, my Dad usually has quite a bit on his mind 🙂