What are the symptoms of a damaged fuel metering unit?
2 Answers
The symptoms of a damaged fuel metering unit in an electronically injected diesel vehicle include the illumination of the malfunction indicator light, and continued use may lead to the engine failing to operate properly. Relevant information is as follows: 1. Introduction: It is installed at the fuel inlet of the high-pressure fuel pump to adjust the fuel supply volume and fuel pressure value, controlled by the ECU. 2. Component: The fuel metering unit is a precision component. Also known as the fuel metering proportional valve, it is installed on the inlet side of the high-pressure fuel pump. In simple terms, it is a special solenoid valve, unique in that its opening can be controlled by the engine computer at any position during its stroke to regulate the volume of fuel entering the plunger chamber of the high-pressure fuel pump.
When the fuel metering unit fails, the car feels like it has no power. When I start the car, the engine cranks for a long time before firing up, and sometimes it doesn't start at all, especially in cold weather. The throttle response is sluggish when driving, struggling even to climb a hill, and acceleration is noticeably weak. Fuel consumption also suddenly spikes—the same route burns through fuel much faster than usual, with the fuel gauge dropping rapidly. The engine runs roughly and shakes violently, often stalling when idling. The check engine light on the dashboard stays on, and an OBD scanner shows relevant trouble codes. If not repaired promptly, the fuel pump may also fail, leading to bigger problems. I recommend regular maintenance to inspect the unit's wiring and connections, and if any issues are found, take it to a professional shop immediately for a replacement—don't delay.
