Gasoline engine driven by variations in the correct way, are divided into mechanical and electrical drive diaphragm driven two. Mechanically driven diaphragm type fuel pump generally rely on the eccentric cam shaft drive, its work is actually:
 oil camshaft rotation, when eccentric wheel shake the most known arm, pull the pump rod membrane, the membrane pump down, ultimately causing suction, suction tank of gasoline begins, and thru the tubing, fuel filter, fuel pump oil back into the room.
Gasoline generator if the eccentric rotary pump oil on top has stopped shake the arm angle, the pump membrane spring done, move the pinnacle membrane pump up the gas valve from oil pressure for the carburetor float chamber.
Usually largest oil gasoline water pump maximum fuel consumption versus gasoline engine 2.5 to a few.Half a dozen times. After the fuel pump and fuel consumption is around the carburetor float chamber needle valve closed, generate the oil pipeline throughout the pressure increased, the response at the pump, the diaphragm shortened trip or give up work.
Identical volume electric fuel pump, you shouldn't believe in the camshaft drive, and repeated by its electromagnetic force pump suction action film. This electric pump, the liberty to select the installation location, and prevent vapor lock phenomenon.
Electronically controlled fuel injection system fuel pump, generally select a new method of electric pump impeller and set up on the gas chamber, the pumping pressure versus the carburetor fuel supply system, welding machine high.