I am about to change my fuel pump, can I expect a lot of gas to drain out? I was hoping (as the line goes over the wheel well before the fuel pump on the block) that high point would stop fuel from flowing from the tank. I had a horrible time changing that small rubber tube midway on the body in the fall - (gas just wouldn't stop flowing) but at least I was in a well ventilated area. This time I'm stuck in the garage. If it will just be a little leakage that's fine, but if the whole tank drains that's another story. What should I expect? Any tips - like does it matter if the gas cap is off?