What is the fault of the Weichai engine oil return blocked alarm?

The diesel pipeline or oil-water separator is clogged. The oil return valve also serves as a fuel pressure regulator. If the diesel pipeline or oil-water separator is blocked and the engine runs abnormally, an alarm will sound. The most intuitive manifestations are difficulty starting the vehicle, unstable idling and engine shaking. , and the engine stops while driving. You can clean diesel pipes or oil-water separators, drain the water separator and replace it if necessary. Finally, completely drain the oil line. The fuel pressure regulator is responsible for adjusting fuel pressure based on changes in engine load so that fuel pressure (related to air-fuel ratio) matches engine load.