Just the other day my neighbor came over to ask if I'd help him move his 2-ton box truck. Rather than put the necessary 10 gallons of fuel in the tanks needed to get it to run (his realization, not mine) I re-routed the fuel line (which was disconnected anyway) to a gas tank bungee corded to the fender. We had to prime the carb repeatedly with gasoline from a pop bottle to get the air out of the re-routed fuel line. He had a deep cycle RV battery in the truck with jumper cables to a little toyota car to get enough amps to crank the beast.
At one point a backfire through the carb set fire to the excess gas that had spilled out of the pop bottle onto the top of the carb. After 6 fire extinguishers that he had stock piled next to the truck for just such an occasion all failed to work due to an assortment of stuck valves, depleted retardant, and corroded pins; he handed me a paper towel (Huh??!!) that I used to frantically pat out the fire.
Running the engine by priming the carb to get the air out of the fuel line was enough to get the air brakes up to pressure, and we were able to move the truck the 12 feet that he needed.