What Causes Abnormal Noise in a Car's Fuel Pump?
2 Answers
Abnormal noise in a car's fuel pump can be caused by: 1. Damage to the fuel pump's check valve resulting in no residual pressure, making starting difficult; 2. Wear of the centrifugal pump impeller leading to reduced fuel supply pressure and weak acceleration; 3. Carbon brush wear causing the fuel pump to stop; 4. Mechanical failures such as rotor jamming, which increases the pump's operating current and may damage relays or fuses. Maintenance methods for car fuel pumps include: 1. Avoid using water-containing substances for vacuum extraction; 2. Use the fuel pump for vacuum extraction after removing most solvents in an oven; 3. Follow the correct sequence when using the vacuum pump; 4. Add the specified grade of lubricating oil; 5. Ensure the fuel is clean, free from impurities and moisture.
As a seasoned driver with years of experience, I often encounter abnormal noises from the fuel pump. The main cause is aging of the fuel pump, where internal components like bearings or gears wear out, resulting in squeaking sounds during operation. Another common reason is the presence of debris inside the fuel pump, such as impurities settled at the bottom of the fuel tank being sucked in and causing vibrations by getting stuck in the pump. If the voltage is unstable when starting the car, the fuel pump motor might produce a buzzing sound. During inspection, listen for changes in the engine sound; a normal start should be quiet, and if abnormal noises are heard, shut off the engine immediately. Ignoring fuel pump noises can lead to fuel supply interruption, causing the car to break down midway, or even damage the fuel injectors. So, don't push your luck—head to a professional repair shop promptly. Safety is far more important than saving money.
