1 Classification fuel pump and working principle
Fuel Pump driven in different ways, can be divided into a mechanically driven and electrically driven diaphragm two kinds. .
a mechanically driven diaphragm fuel pump
General against the drive cam on the camshaft, the operation of which is:
① suction cam shaft, when the eccentric rocker arm top, pull rod pump membrane, the pump membrane decreased, creating suction, begins in the gasoline tank was aspirated, and through the tubing, fuel filter, fuel pump into the oil chamber of the human .
② pump oil through the eccentric rotation angle is no longer a top rocker arm, pump springs stretched film, a top film acting pump rises, the gas pressure supplied from the oil valve of the carburetor float chamber.
Usually a fuel pump maximum fuel than gasoline fuel consumption maximum 2.5 to 3.5 times. When the fuel pump is greater than the amount of fuel carburetor bowl needle valve closed, the pressure pump oil line is improved and the reaction to the oil pump, to shorten the stroke of the diaphragm or stop working.
mechanically driven diaphragm works
2. The electric fuel pump
Motor Gasoline the work of the pump is: do not rely on a camshaft driven by the electromagnetic force and repeatedly suction pump action film. This electric pump, are free to choose the installation location, and to prevent vapor lock phenomenon.
electronically controlled fuel injection system fuel pump, generally using the new impeller electric pump, and installed in the gasoline tank, which is higher than the pumping pressure fuel pump carburetor fuel supply system.
electric fuel pump works vane