The petroleum pump is in the car's fuel tank, driven by electricity, that is, after you turn the key, the petroleum pump is now working.
The function of the gasoline pump is to draw the gasoline out of the tank and press it into the float chamber of the carburetor through the pipeline and the fuel filter. It is precisely because of the gasoline pump that the fuel tank can be placed at the rear of the car far from the suggested machine and lower than the recommended machine.
Gasoline pumps can be divided into mechanically driven diaphragm type and electric driven type according to different driving methods. The mechanically driven diaphragm type gasoline pump is generally driven by an eccentric on the camshaft, and its operation is:
1 In the oil absorbing camshaft tumbling, when the eccentric wheel moves the rocker arm and pulls down the pump film pull rod, the pump film drops, the suction force is exerted, the gasoline is sucked out from the fuel tank, and the oil passes through the oil pipe, the gasoline filter, and the gasoline pump. room.
2 Pump oil When the eccentric rotates through a certain angle and no longer pushes the rocker arm, the pump membrane spring spreads, the top pump membrane rises, and the gasoline is pumped from the oil discharge valve to the float chamber of the carburetor.
Generally, the maximum fuel supply of a gasoline pump is 2.5 to 3.5 times larger than the maximum fuel consumption of a gasoline engine. When the pump oil amount is greater than the fuel consumption and the carburetor float chamber needle valve is closed, the pressure in the oil pump oil discharge line is improved, and the oil pump is reacted to shorten or stop the diaphragm stroke.
There is also an electric gasoline pump that does not rely on the camshaft to drive the pump membrane repeatedly by electromagnetic force. This electric pump is free to choose the orientation of the device and prevent the appearance of air resistance.
The gasoline pump of the electronically controlled gasoline injection system generally adopts a new type of impeller type electric pump, and the equipment is in the gasoline tank, and the pumping pressure is also higher than that of the gasoline pump of the carburetor fuel supply system.