What are the reasons for no oil output from the high-pressure pipe of an electronically controlled diesel common rail system?
2 Answers
Analysis of the reasons for no oil output from the high-pressure pipe of an electronically controlled diesel common rail system is as follows: 1. The auxiliary shutdown switch is in the connected state. 2. The rail pressure is too low. 3. The battery voltage is too low. 4. The synchronization signal is incorrect. Additional information: 1. A high-pressure common rail diesel engine refers to a fuel supply machine where the generation of injection pressure and the injection process are completely separated in a closed-loop system composed of a high-pressure fuel pump, pressure sensor, and electronic control unit (ECU). 2. The high-pressure fuel pump delivers high-pressure fuel to the common rail (Rail), and precise control is achieved through the fuel pressure in the common rail, making the high-pressure pipe pressure (Pressure) independent of the engine speed, which can significantly reduce the variation of diesel engine fuel supply pressure with engine speed.
I've seen quite a few cases where the high-pressure pipes of electronically injected diesel engines fail to deliver fuel. When tinkering with them myself, I found the most common issue is a clogged fuel filter, where accumulated impurities block the fuel flow. The high-pressure pump is another critical point—if the pump is worn or jammed with debris, the fuel pressure won't build up, naturally resulting in no fuel delivery. Sometimes, the entire common rail system's pipes get blocked by sludge or dirt, and when sensors like the pressure sensor fail, the ECU can't receive signals and thus can't control fuel injection. My suggestion is to first check the filter yourself and try replacing it with a new one, while also listening for any unusual noises from the pump. If that doesn't work, check for loose wiring connections. If such faults aren't addressed promptly, the engine may suddenly stall while driving, which is extremely dangerous. It's best to regularly maintain the filter and not skimp on this small expense.
