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What is the function of a fuel pump?

1Answers
StRyder
07/29/2025, 04:30:49 AM

The function of a fuel pump is to draw fuel from the fuel tank during engine operation and continuously deliver it to the engine at a certain pressure through the fuel supply line. The fuel is then pressurized a second time by the high-pressure fuel pump and supplied in precise quantities to each cylinder according to the engine's firing order. Currently, most vehicles use vane-type electric fuel pumps, which offer advantages such as high fuel delivery volume, high and stable fuel pressure, low noise, and long service life. When troubleshooting a fuel pump in a vehicle that has been in use for an extended period, it is important to avoid dry testing the fuel pump. This is because after removing the fuel pump, residual fuel remains inside the pump housing. If the brushes and commutator make poor contact during electrical testing, sparks may occur, potentially igniting the fuel inside the pump housing and causing an explosion.

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