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May Automotive Parts Manufacturing & Supplying Co,.Ltd
May Automotive Parts Manufacturing & Supplying Co,.Ltd

Fuel Pump Assemblies

EFI fuel pump module assembly is a combination of a electric fuel pump, a fuel gauge sending unit, a pressure regulator valve, a fuel tank pressure sensor. It is an important part of the electronic fuel injection system of automotive fuel system parts. Fuel pump and assembly's basic function is to provide fuel with certain pressure to the engine fuel injection system. Therefore, the quality of the EFI fuel pump assembly will directly affect the working condition of the fuel injection system.

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Fuel Pump Module Assembly Functions

The function of the automotive fuel pump is to suck out the fuel from the fuel tank, pressurize it and deliver it to the fuel supply pipe, and cooperate with the fuel pressure regulator to establish a certain fuel pressure. If it is broken, it will cause the fuel pump module assembly to collapse and the vehicle cannot be started; the fuel supply pressure is reduced, and there is no sound of the fuel pump running; the acceleration is weak, and there will be abnormal noises when driving; the engine fault light is on, the engine vibrates abnormally; it is difficult to start when starting, it takes a long time to turn on the vehicle.

Fuel pump module assembly failure can be determined by an on-board inspection.

  • Connect the fuel pump test terminal on the diagnostic base to the 12V power supply with a special wire;

  • Turn the ignition switch to the "ON" position, but do not start the engine;

  • Unscrew the fuel tank cap, you can hear the sound of the fuel pump working, or you should feel the pressure when you squeeze the fuel hose with your hand;

  • If the working sound of the fuel pump cannot be heard or there is no pressure in the fuel inlet pipe, the fuel pump should be repaired or replaced;

  • If the fuel pump fails to work, and the above inspections are normal, check whether the fuel pump circuit wires, relays, and fuses of the fusible link are open.

Note when disassembling the fuel pump, please release the fuel system pressure and turn off the electrical equipment. After removing the fuel pump, measure the resistance between the two terminals of the fuel pump, it should be 2~3Ω. Use the battery to directly energize the fuel pump, and you should hear the sound of the high-speed rotation of the fuel pump motor. Note: the energization time should not be too long.

How Long Does A Fuel Pump Assembly Last?

Around 100,000 miles. Fuel pumps are meant to last around 100,000 miles, but most people never have to replace their fuel pumps. They are typically built to last since they are positioned in a hard-to-access place within your fuel tank

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