Mercedes W164 W203 C219 OM642 Fuel Injector Rail Line A6420700695

The Mercedes W164 W203 C219 OM642 Fuel Rail is an original component of the diesel engine fuel system, designed for use in OM642 units in selected Mercedes models of the W164, W203, and C219 classes. This product from the injector nozzles category ensures stable fuel pressure in the rail, which is crucial for the correct operation of the common rail injection and smooth engine performance.

Specifications and technical data

• SKU: A6420700695
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420700695
• Substitutable numbers: A6420700695, A 642 070 06 95
• Category: Fuel Injectors

Technical Characteristics of the OM642 Fuel Rail

The fuel rail for the OM642 engine operates within a common rail system, where high-pressure fuel is supplied to the injectors via a shared manifold. The appropriate design of the fuel rail allows for:

• maintaining stable fuel pressure across the entire engine load range,
• precise fuel supply to the injectors in each cylinder,
• reducing pressure pulsations, which contributes to smoother engine operation.

A properly selected fuel rail is particularly important in V6 diesel engines, where uniform supply to all cylinders directly impacts performance, fuel consumption, and emission levels.

Application in Mercedes W164, W203, C219 Models

The Mercedes W164 W203 C219 OM642 Fuel Rail is designed to work with the OM642 diesel engine used in popular Mercedes SUV, sedan, and coupe models. Using an original fuel rail from the same component family as the factory injection system elements allows for:

• maintaining factory engine operating parameters in terms of power and torque,
• correct interaction with the factory engine control unit and fuel pressure sensors,
• reducing the risk of diagnostic errors related to incorrect common rail pressure.

Selecting a fuel rail dedicated to a specific OM642 engine family facilitates installation and minimizes the need for fuel system modifications.

Benefits of Using an Original Fuel Rail

In common rail systems, the quality of the fuel rail directly affects the durability of the injectors and the high-pressure pump. Using an original component from the injector nozzles category allows for:

• stable fuel system operation at high working pressures,
• reduced risk of uneven engine operation and power drops,
• better control over fuel delivery, promoting economical operation.

This solution is particularly recommended for comprehensive injection system servicing, e.g., after injector regeneration or high-pressure pump replacement, when system consistency is paramount.

Component Condition and Installation Aspects

The offered fuel rail is a used part, sourced from disassembly, representing a reasonable compromise between cost and maintaining the original manufacturer's specifications. This type of part is a good choice for repairs where precise fit to the factory fuel system without the need for adaptation or modification is crucial.

Before installation, standard service procedures are recommended, including checking system tightness, the condition of high-pressure lines, and the proper operation of the injectors. A correctly selected and installed fuel rail supports trouble-free starting, smooth idling, and stable performance across the entire RPM range.

Injection System Diagnostics and Prevention

In case of problems with the diesel fuel system – such as starting difficulties, power loss, excessive smoke, or appearing fuel pressure errors – a comprehensive diagnosis of the entire common rail system is advisable. A detailed discussion of symptoms and possible causes can be found in the article: diesel injector faults – symptoms, consequences, and diagnostics, which helps to better understand the relationships between the condition of injectors, pump, and fuel rail.

Other Mercedes Injector Nozzles

If you are looking for other Mercedes injector nozzles compatible with a specific model or engine version, check out our dedicated offer: Mercedes injector nozzles. This will allow you to easily compare available injection system components within a single brand and select the part suitable for your vehicle.