The MTD BS-597338 Lawn Tractor Fuel Pump moves gasoline from the fuel tank to the carburetor in compatible small engines used on lawn tractors and similar equipment. This pulse-type pump connects to the engine and fuel lines. It works by using pressure pulses from the engine to flex an internal diaphragm, drawing fuel from the tank and pushing it toward the carburetor for combustion. This process maintains a steady fuel supply while the engine runs. Replacing a worn or faulty pump restores proper fuel delivery and supports consistent engine operation.