I had a friend who had an old truck (back in the early 70s). The whole time he had the truck it ran great, he drove it everywhere. The only problem was that every now and then the motor would shut down. It would completely stop running. He would try and try to start the motor but it wouldn't re-start. Over the years he found that if he let the truck sit for 10 to 15 minutes he could easily crank it up and go. One day his gas tank sprung a leak, this was after he had the truck for about 3 1/2 year. He parked the truck and pulled the tank to fix the leak. After he pulled the tank he did his best to drain as much gas as possible by turning it upside down and letting the gas flow out the fill tube. Now...........do I tell you the rest of the story or can you guess what was causing the motor to die?????