When I fill the tank to the top (or close to) fuel leaks from the bottom of the truck. I generally only put 10 gallons in, so it is not a big issue (except for the leaking combustable liquid). The issue is finding the leak. It only leaks when I fill the tank, but I cant really spend time under the truck at the gas station. And when the tank is full, it is rather heavy if I were to take it off the truck. I notice a gas smell on hot days when I have the rear window open, so I'd like to get it fixed. Does anyone have suggestions on how to find the leak?