Modern electronic fuel pump assemblies for automobiles generally include fuel pumps, plastic flanges, plastic oil storage tanks, level sensors, pressure regulators, and fuel filters.
Fuel is delivered from the oil outlet through the fuel line to the engine. Excess fuel passes through the return line and flows back to the tank via the pressure regulator. The main function of the pressure regulating valve is to adjust fuel pressure inside the fuel line to stabilize it in the fuel. Within the pressure range, and eliminate and buffer the interference caused by changes in the fuel supply flow of the electric fuel pump.
In addition to providing fuel with a certain pressure, the fuel pump assembly is generally integrated with a liquid level sensor. The floating structure causes the resistance value to change according to the fluctuation of the liquid level in the tank, so that the signal is sent to the combination meter through the circuit signal and the oil is displayed. Bit.
In order to prevent the abnormal increase of the pressure in the automobile oil supply system due to special reasons, such as the blockage of the oil circuit, and damage to the components, generally when the working pressure of the oil circuit rises to 500 to 750 kPa, the safety valve opens and the fuel flows back to the fuel tank. Reduce pressure to avoid damaging parts.
Electronic fuel pump electrical principle is: When the ignition key to the ON block, ECU control relay conduction, the fuel pump idle operation after 5s idling, to prevent idle time is too long, heat and burned. When the ignition key reaches the Start block, the electronic fuel pump operates normally and provides the engine with fuel.
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