Many forklifts are made to run on propane gas. Propane-powered forklifts are simple to refill. The gas is stored inside a pressurized tank on the truck's back. The propane is pushed into the engine, where it is converted into vapor and the vapor combines with air. The throttle of the forklift is utilized to control the vapor flow. A spark plug ignites the vapor and air mixture producing pressure that makes the pistons move. The pistons turn the wheels and run the hydraulic pump.
Propane powered forklifts are recommended for use in warehouses and other buildings since they are clean burning with low emissions.
The forklift's hydraulic system is what allows it to raise and transport really heavy objects from location to location. A pump, tubes and cylinders make up the hydraulic system. The pump forces dense fluid through the tubing and into the cylinders. The pressure build up pushes a piston, that lifts the forks. When the operator lowers the forks, the hydraulic fluid flows out of the cylinders and back in the pump.
Where maneuverability is required, propane forklifts are the most suitable. Not like a car, a forklift makes use of its rear wheels to turn, that allows the forklift to pivot quickly on a tight radius.