What Causes Abnormal Noise in the Fuel Pump?

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The fuel pump is a component of the fuel injection system in electronic fuel injection vehicles, installed inside the fuel tank. Its main function is to draw fuel from the tank, pressurize it, and then deliver it to the fuel supply line. Abnormal noise in the fuel pump may be caused by the following reasons: 1. Damage to the fuel pump check valve: results in no residual pressure, making it difficult to start. 2. Wear of the centrifugal pump impeller: leads to reduced fuel supply pressure and weak acceleration. 3. Wear of the carbon brushes: causes the fuel pump to stop, preventing the vehicle from starting. 4. Mechanical failures such as rotor jamming: increases the working current of the pump, potentially damaging the relay or fuse.