What are the reasons for the high-pressure oil pump of Jiangling Baodian not delivering oil?

[SanZachary]

Jiangling Baodian high-pressure oil pump not delivering oil may be caused by: the auxiliary shutdown switch being in the connected state, rail pressure being too low, or the battery voltage being too low. Below are detailed explanations of the working principles of the high-pressure oil pump: Oil suction process and oil return stroke: The downward movement of the pump piston provides the power for oil suction, simultaneously opening the intake valve, allowing fuel to be drawn into the pump chamber. In the final third of the pump piston stroke, the fuel pressure regulating valve is energized, keeping the intake valve open during the initial upward movement of the pump piston to facilitate oil return. This is the oil return process. To control the actual fuel supply, the intake valve remains open during the initial upward movement of the pump piston, with excess fuel being pushed back to the low-pressure side by the pump piston. The pressure damper's role is to absorb the pressure fluctuations generated during this process. This is the oil return stroke.