What are the causes of abnormal noise in the fuel pump?
2 Answers
The causes of abnormal noise in the fuel pump are: 1. Damage to the fuel pump check valve resulting in no residual pressure, causing difficulty in starting; 2. Wear of the centrifugal pump impeller leading to reduced fuel supply pressure and weak acceleration; 3. Wear of the carbon brushes causing the fuel pump to stop; 4. Mechanical faults such as rotor jamming, which increase the working current of the fuel pump, damaging the relay or fuse. The maintenance methods for the automobile fuel pump are: 1. Do not use water-containing substances for vacuum extraction; 2. Use the fuel pump for vacuum extraction after removing most of the solvent in the oven; 3. Use the vacuum pump in the correct sequence; 4. Add the specified grade of lubricating oil; 5. The fuel must be clean and free of impurities and moisture.
There are various reasons for abnormal noises from the fuel pump, and I've encountered many cases in my car repair experience. The most common issue is internal wear of the fuel pump, such as aging motor bearings or deformed impellers, which cause rattling sounds during operation. Additionally, impurities in the fuel tank or a clogged fuel filter can force the pump to work harder, producing a buzzing noise as if protesting. Unstable voltage can also easily cause noises—if the battery is low or wiring connections are loose, the pump's irregular rotation speed may result in squealing sounds. I remember a friend's car once made such noises, and upon inspection, it turned out to be caused by excessive carbon buildup due to poor fuel quality, making it difficult for the pump to draw fuel and causing it to roar. When you hear abnormal noises, don't ignore them. Get them checked, cleaned, or replaced by a professional shop promptly. Otherwise, it could lead to a complete failure, and being stranded on the road would be a real hassle.
