Pressure Rail Line Mercedes W203 W211 W639 OM646 Fuel Injector A6110700395

The MERCEDES W203 W211 W639 OM646 Fuel Rail is a fuel system component designed for installation in OM646 diesel engines, used in popular Mercedes C-Class, E-Class, and Vito/Viano models. The offered fuel rail comes from the injector nozzles category and is a solution for users looking for a proven component for professional repair or complete overhaul of the injection system.

Specifications and technical data

• SKU: A6110700395
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6110700395
• Substitutable numbers: A6110700395, A 611 070 03 95, KZ
• Location on the vehicle: Front
• Category: Fuel Injectors

Purpose and Function of the OM646 Fuel Rail

The fuel rail in the OM646 engine is responsible for stable distribution of fuel under high pressure to individual injectors. A correctly selected fuel rail is crucial for:

• maintaining uniform fuel pressure throughout the common rail system,
• precise fuel metering by the injectors,
• proper operation of the diesel engine across the full range of loads.

Its placement at the front of the vehicle facilitates easier service access and allows for efficient diagnostics and replacement in workshop conditions.

Benefits of Using an Original Mercedes Fuel Rail

Choosing a fuel rail dedicated to the OM646 unit in W203, W211, and W639 models provides a number of practical benefits:

• Factory geometric fit to the engine head and accessories, without the need for modifications.
• Correct fuel flow characteristics in line with the engine manufacturer's specifications.
• Stable operation of the injection system during startup, city driving, and under load.
• Reduced risk of leaks at connections with high-pressure lines.

For Mercedes common rail engines, maintaining the correct parameters of the fuel rail directly impacts the smoothness of operation, dynamics, and fuel consumption.

Application in Mercedes W203, W211, W639 Models

The MERCEDES W203 W211 W639 OM646 Fuel Rail is designed for diesel units used in:

• Mercedes C-Class W203 – compact body, requiring precise and stable fuel supply,
• Mercedes E-Class W211 – executive cars, where the injection system is important for driving comfort and smoothness,
• Mercedes Vito/Viano W639 – commercial and passenger vehicles, where engine durability and consistent operating parameters are key.

In each of these applications, a correctly selected fuel rail supports trouble-free diesel engine operation and facilitates subsequent computer diagnostics and fuel pressure measurement.

Product Characteristics and Condition

The offered fuel rail is an original Mercedes part, sourced from disassembly. This used component allows for economical repair of the injection system while maintaining the factory design specifications. This type of solution is often chosen by workshops specializing in OM646 engine service and by informed users who prefer used OEM parts.

Its placement at the front of the engine facilitates installation and subsequent visual inspection of connections, which is important for operation in demanding conditions (city driving, long distances, load carrying).

Diagnostics and Prevention of the Injection System

When replacing the fuel rail, it is advisable to pay attention to the overall condition of the fuel system and injectors. For users who want to better understand the symptoms of worn injection components and the consequences of neglecting them, we recommend the article: Diesel Injector Faults – How to Recognize Them and What Their Neglect Threatens. This is a practical addition to your knowledge when planning a comprehensive service for the OM646 engine.

Related Mercedes Injector Nozzles

If you plan to replace more fuel system components during a single repair, also check out other Mercedes injector nozzles available in our offer. You can find a full list here: Mercedes injector nozzles, which will help you select compatible components for your specific engine and vehicle model.