Fuel pump definition
A vacuum device, operated either mechanically or electrically, that is used to draw gasoline from the tank and sends it into the carburetor or fuel injector nozzles . Mechanical pumps have a rocker arm that is activated by a cam on the camshaft ; the arm causes a diaphragm to move up and down, thus pulling the gas through the pump. Some electrical pumps have a rocker arm which is activated electrically and does the same thing as the mechanical pump. Other electrical pumps are located at the bottom of the fuel tank and push the fuel through the fuel lines.