Why does the high-pressure fuel pump fail?

1 Answers
AnnieMarie
07/30/25 5:44am
The reasons for high-pressure fuel pump damage are: 1. Refueling only when the fuel warning light comes on: This shortens the pump's service life, as too little remaining fuel or complete fuel exhaustion may burn out the pump; 2. Overfilling the tank: This can cause the fuel float and sensor to malfunction, distort the fuel gauge, and increase fuel consumption. Symptoms of a damaged high-pressure fuel pump include: 1. Severe engine vibration; 2. Poor acceleration; 3. Unstable idle; 4. Difficulty starting or stalling. The high-pressure fuel pump is a lightweight and compact pump, mainly categorized into three types: in-line, distributor, and unit pumps. It requires a power source to operate, with the lower camshaft driven by the engine crankshaft gear.
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