What are the causes of abnormal noise from the high-pressure fuel pump?

[RemingtonLynn]

High-pressure fuel pump abnormal noise causes are as follows: 1. Cold start noise: When the car starts cold, the engine sound may be slightly louder than when the engine is warm. As long as the sound is uniform and soft, not harsh, it is generally not a problem. 2. Oil-related issues: It is necessary to add the appropriate type of engine oil. The high-pressure fuel pump is a lightweight and compact pump, which can be categorized into in-line, distributor, and unit types. It requires a power source to operate, with the lower camshaft driven by the engine crankshaft gear. The functions of the high-pressure fuel pump are: 1. Increase fuel pressure: It can boost fuel pressure to ensure complete combustion of the fuel. 2. Improve atomization effect: It achieves optimal atomization through high-pressure injection. 3. Serve as a power source: It can act as a power source for hydraulic devices such as jacks, heading machines, extrusion presses, and cotton gins.