What are the symptoms of a faulty high-pressure fuel pump?

[McSabrina]

High-pressure fuel pump failure symptoms are similar to those of a gasoline pump, including severe vibration, poor acceleration, unstable idle, difficulty starting, and even stalling. More extended information is as follows: Overview: Both gasoline pumps and high-pressure fuel pumps can fail, but the probability of failure is not high. Moreover, with proper usage, they can last over 100,000 kilometers without any issues. For high-pressure fuel pumps, unlike electronically driven gasoline pumps, they are purely mechanically driven (by the camshaft), and their failures typically include mechanical damage, clogging, oil leakage, etc. Working Principle: During the suction process, the downward movement of the pump piston provides the suction force, simultaneously opening the intake valve to draw fuel into the pump chamber. In the final third of the pump cycle, the fuel pressure regulator valve is energized, allowing the intake valve to remain open during the initial upward movement of the pump piston for fuel return.