Why does the fuel pump fail?
2 Answers
Fuel pump failure can be attributed to the following reasons: Low fuel level: When the fuel level in the tank is insufficient, the fuel level warning light in the instrument panel illuminates. This occurs because the fuel pump motor does not receive adequate cooling and lubrication due to the low liquid level, leading to motor overheating or even complete failure. Prolonged operation under such conditions accelerates fuel pump damage. Poor fuel quality: Impurities or foreign particles present in the gasoline can contaminate the fuel pump. When these particles enter the internal bearings of the fuel pump, they accelerate bearing wear, ultimately causing fuel pump failure. Failure to replace the fuel filter: A clogged fuel filter forces the fuel pump to operate under high load conditions for extended periods, resulting in fuel pump damage.
I've repaired many cars before, and fuel pump failures are all too common, mainly caused by running the tank too low, overheating and burning it out. It's like extreme thirst for humans—when the tank is nearly empty but you keep driving, the pump has to work extra hard to draw fuel, and the heat can get so intense it damages the components. Also, low-quality gasoline from shady gas stations mixed with sand or metal shavings can jam the pump's motor rotor. The worst are cars left undriven for too long—the fuel pump rusts at the bottom of the tank, and when you start it, you hear a clunking noise before it finally gives out. My advice: refuel when the tank is down to a quarter, avoid cheap low-quality fuel, and regularly inspect the fuel system to save yourself the hassle.
