BOSCH Solenoid Valve Replaced

Solenoid valve EFI fuel metering unit 0928400568 is usually used in the fuel system of diesel engines.

• The main function of the metering unit 0928400568 is to accurately control the amount of pressurized fuel entering the pump when the engine is running, according to the difference between the fuel injection rate of the injector calculated by the ECU (electronic control Unit) and the current and target rail pressure.
• It is very important to the diesel engine, is the high-pressure oil circuit part of the first "checkpoint", and is one of the engine in addition to the fuel nozzle easily damaged parts.

• It is usually composed of a valve core, a housing with an electromagnetic coil, and a plunger.
• When the controlled current passes through the solenoid coil, it creates a magnetic force that pushes the spool down to a position next to the plunger.
• The fuel flow can be precisely controlled by adjusting the size of the spool opening.

• The engine ECU calculates the amount of fuel that needs to enter the pump according to the injection demand and rail pressure target.
• The control unit sends a signal to an electromagnetic coil to generate a magnetic force through an electric current.
• The magnetic force acts on the spool, pushing the spool to adjust the opening size, thereby controlling the fuel flow.

Frequently Asked Questions (FAQ)

1. What is the OE number and basic function of this solenoid valve?
The OE number is 0928400568. This is an EFI fuel metering unit used in diesel engines. Its main function is to accurately control the amount of pressurized fuel entering the pump based on signals from the ECU.

2. How does the ECU control the 0928400568 metering unit?
The ECU calculates the fuel injection rate needed by the injectors and monitors the current rail pressure versus the target pressure. It then sends a variable electrical signal to the metering unit's coil. The coil generates a magnetic field that pushes the spool to a specific position, controlling fuel flow into the pump.

3. Where is this metering unit located in the diesel fuel system?
The 0928400568 is located in the high-pressure oil circuit and acts as the first "checkpoint" between the fuel supply pump and the high-pressure pump. It sits upstream of the injectors and regulates how much fuel enters the high-pressure side of the system.

4. What symptoms indicate a failed BOSCH metering unit?
Common symptoms include: rough or unstable idle, loss of power under acceleration or load, black exhaust smoke, hard starting (cranks but does not start), or engine stalling. Diagnostic fault codes related to fuel pressure regulation or metering unit circuit will likely appear.

5. Why is the metering unit considered a commonly damaged part?
The metering unit is one of the most easily damaged parts in a diesel fuel system, second only to the injectors. Contaminated fuel (dirt, water, or deposits from poor-quality biodiesel) can cause the internal spool to stick or wear. Electrical surges or voltage irregularities can burn the coil. Regular fuel filter changes help protect this component.

6. What is the internal construction of the 0928400568 metering unit?
The unit is composed of a valve spool, a housing with an electromagnetic coil, and a plunger. When the coil receives current, magnetic force pushes the spool to a position near the plunger. By adjusting the spool opening size, the unit precisely controls fuel flow.

7. Does the BOSCH solenoid valve replaced 0928400568 come with a warranty?
Yes. Flying Bull provides a 1‑year warranty against manufacturing defects. Damage caused by contaminated fuel, incorrect installation, voltage spikes, or misuse is not covered. Always use clean diesel fuel and replace fuel filters regularly to protect the new metering unit.

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