They were on their way to a car show. Pap thought he had more gas in the tank than he actually did. When he and one of his grandsons were on their way up a rather steep hill, their 1924 Model T Ford sputtered to a stop. They were out of gas. Actually, they were only low on gas, but in a Model T the net effect can be the same. Several miles away from the nearest gas station, they were stuck.
“Looks like your gonna have to back her up that hill,” came a voice from a nearby by house, as an older gentleman came walking toward them with a gas can. He was indeed correct. He was smiling, because he remembered the Model T, and he knew that they didn’t come equipped with fuel pumps. Instead of a pump, the fuel reached the engine from a tank under the front seat. It was a gravity-flow system, and when the tank was low and the car was on a steep grade, no fuel reached the carburetor. In such situations, Model T drivers figured out that they could back their cars up a hill.