Why is the high-pressure fuel pump prone to failure?
2 Answers
High-pressure fuel pump is prone to failure for the following reasons: 1. Improper refueling behavior may cause damage to the fuel pump. 2. When refueling the car, try not to wait until the fuel warning light comes on. Doing so will shorten the service life of the fuel pump. Too little fuel or running out of fuel may burn out the pump. 3. Avoid filling the tank completely when refueling. If you often drive in the city and refueling is convenient, there is no need to fill up completely, as this may cause the fuel float and sensor to malfunction, distort the fuel gauge, and increase fuel consumption. Therefore, it is recommended to refuel when the fuel is almost depleted. The main purpose of the high-pressure fuel pump is to serve as the power source for hydraulic devices such as jacks, heading machines, extruders, and cotton gins. The installation sequence of the high-pressure fuel pump is as follows: 1. During the installation of the high-pressure fuel pump, to prevent debris from falling into the machine, all openings should be covered. Place the unit on the foundation with embedded anchor bolts, and use pairs of wedge pads between the base and the foundation for alignment. 2. Align the concentricity of the pump shaft and the motor shaft. The allowable deviation on the outer circumference of the coupling is 0.1 mm; the gap between the two coupling planes should be 2–4 mm (smaller values for smaller pumps), and the gap should be uniform with an allowable deviation of 0.3 mm. 3. After connecting the pipelines and confirming the motor rotation direction, connect the coupling and recheck the concentricity of the shafts. After 2–3 hours of actual test operation, perform a final inspection. If there are no issues, the installation is considered qualified.
I previously researched automotive engine systems and found that high-pressure fuel pumps are prone to issues mainly because they operate under extremely high pressure inside the engine, enduring immense physical stress daily. Over long-term use, impurities or moisture in the fuel can enter the pump, accelerating wear on internal components such as the pump body or valves. Additionally, frequent acceleration and deceleration operations cause vibrations that fatigue and crack metal parts. Moreover, when fuel quality is poor, deposits can clog the fuel lines, further increasing the burden. Modern direct-injection engines require more precise pump designs, and defects such as poor sealing or heat-intolerant materials can also lead to failures. Regularly using high-quality gasoline and inspecting the fuel filter are effective ways to reduce wear; otherwise, the pump may fail quickly.
