There are numerous types of forklifts that are operated by propane gas. Propane-powered forklifts are really easy 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 flow of vapor. A spark plug fires up the vapor and air mixture producing pressure which makes the pistons move. The pistons run the hydraulic pump and turn the wheels.
As the kinds of forklifts which are operated by propane are clean burning and have low emissions, they are best to be used inside other buildings and warehouses.
The forklift's hydraulic system is what allows it to lift and transport really heavy things from place to place. A pump, tubes and cylinders make up the hydraulic system. The pump forces dense fluid through the tubing and into the cylinders. The build up of pressure pushes a piston, that lifts the forks. When the forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back in the pump.
Where maneuverability is necessary, propane forklifts are the most suitable. Not like an automobile, a forklift makes use of its rear wheels to turn, that allows the forklift to turn fast on a tight radius.