The Mercedes W205 W213 OM654.920 Diesel Fuel Rail is an original component of the diesel engine fuel system, designed for modern Mercedes units from the OM654 family. The precise design of the rail ensures stable fuel pressure across the entire load range, which translates to smooth engine operation and proper injector cooperation.
Specifications and technical data
- SKU: A6540700195
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A6540700195
- Substitutable numbers: A6540700195, A 654 070 01 95
- Fuel type: Diesel
- Category: Fuel Injectors
Technical Characteristics of the Fuel Rail
The fuel rail in a diesel engine plays a crucial role in the common rail system, responsible for storing fuel under high pressure and distributing it evenly to individual injectors. In the case of the OM654.920 unit, a solution adapted to the requirements of modern exhaust emission standards has been implemented, where pressure stability and rapid system response directly impact the engine's running smoothness and performance parameters.
The rail in question is a component from the injector nozzles category, working with precise high-pressure injectors. Its design is optimized for operation with Diesel fuel, allowing it to maintain appropriate injection parameters at both low and high loads.
Purpose and Application in Mercedes W205 / W213
The Mercedes W205 and Mercedes W213 with the OM654.920 engine utilize an advanced injection system where the fuel rail is one of the main components responsible for the correct supply of the power unit. Using an original rail dedicated to this engine generation allows for maintaining:
- correct fuel pressure across the entire RPM range,
- stable injector operation under variable load,
- consistency with the factory engine control unit calibration,
- appropriate cold and hot start characteristics.
By maintaining compliance with the original fuel system design, the rail supports the correct operation of emission control systems and multi-phase injection strategies used in modern Mercedes diesel engines.
Benefits of Using an Original Fuel Rail
Choosing an original fuel rail for the OM654.920 in W205 and W213 bodies is a solution that technically supports long-term and predictable vehicle operation. The most important advantages include:
- Factory Fitment – maintaining geometry and mounting points consistent with the manufacturer's design, which facilitates installation and minimizes the risk of leaks.
- Proper Injector Cooperation – even supply to all cylinders, which reduces the risk of differences in fuel delivery.
- Stable Common Rail System Parameters – maintaining the correct operating pressure, essential for performance and fuel consumption.
- ECU Software Compatibility – no need for injection map modifications or adaptations beyond the standard service procedure.
Component Condition and Installation Aspects
The fuel rail comes from a vehicle where it has already been used, allowing it to be applied as a functional replacement for the factory component in the diesel fuel system. When installing, it is recommended to use new seals and adhere to the manufacturer's procedures regarding tightening torques and bleeding the fuel system.
Due to the rail's importance for the entire injection system's operation, a good complement to replacement is checking the condition of the injectors and diagnosing the rail pressure. Properly performed installation and verification of operating parameters allow for restoring stable fuel system operation and reducing the risk of further failures.
Injection System Diagnostics and Technical Knowledge
In case of diesel engine problems – such as rough idling, power loss, or starting difficulties – a full diagnostic of the injection system is recommended. The following material describing typical symptoms and consequences of neglect in this area may be helpful: diesel injector faults – symptoms, consequences, and diagnostics. It allows for a better understanding of the relationships between the condition of the fuel rail, injectors, and other common rail system components.
Related Products from the Same Category
If you are looking for other injector nozzles for Mercedes from the same model group or related power units, check out the Mercedes injector nozzles available in our assortment to select fuel system components that are technically and qualitatively consistent.
