What Causes Abnormal Noise in the Fuel Pump?
3 Answers
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.
Last time my car's fuel pump was buzzing, which scared me into checking the cause immediately. It could be a problem with the fuel pump itself—over time, the internal motor ages, the bearings wear out, and strange noises can occur during operation. Additionally, if there's too much debris in the fuel tank clogging the filter screen, the fuel pump has to work harder to draw fuel, which can also cause noise. If you frequently wait until the fuel gauge warning light comes on before refueling, the fuel pump may overheat due to poor cooling. Poor-quality gasoline can also lead to carbon buildup, affecting the pump's performance. Poor electrical connections or unstable voltage can also cause unusual noises. It's best not to delay—find a reliable auto repair shop to check it out. Otherwise, if the fuel pump fails, the car could break down, which would be troublesome. To prevent this issue, refuel regularly before the tank is empty and try to use fuel from reputable gas stations.
When my car's fuel pump hums, it sounds like a bee is flying inside the fuel tank. The most common causes are internal wear of the fuel pump, which makes a squeaky noise when rotating; or the bottom of the fuel tank being too dirty, with the filter screen clogged by debris, causing the fuel pump to work hard and produce abnormal sounds. Low fuel levels can also cause this, as insufficient fuel affects heat dissipation. Poor electrical connections or unstable battery voltage are other possible reasons. It's best to address abnormal noises quickly—I learned the hard way by delaying for a week, only for the fuel pump to completely fail on the road. Now, I always keep the fuel tank above a quarter full and replace the fuel filter regularly, and the problem has basically disappeared. The mechanic said that occasionally using fuel system cleaner can also help extend the fuel pump's lifespan.
