Mercedes W164 W204 W221 OM642 Fuel Injection Line Pressure Pipe Rail Injector

Mercedes W204 OM642 Diesel Fuel Line is an original part from the Hoses, Pipes and Tubes group, designed for the diesel engine fuel system. Engineered for the specific OM642 engine architecture, it ensures stable fuel delivery and proper integration with other injection system components.

Specifications and technical data

• SKU: A6420701833
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420701833
• Substitutable numbers: A6420701833, A 642 070 18 33, KZ
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Intended Use and Function in the Fuel System

This fuel line is dedicated to Diesel engines used in Mercedes W204 models with the OM642 unit. It is responsible for the safe and leak-free delivery of fuel between system components, which directly impacts stable engine operation, its running smoothness, and correct fuel metering.

The precise geometric fit of the line to the powertrain minimizes the risk of stress, leaks, and improper positioning within the engine bay. This allows the fuel system to maintain proper flow parameters, enabling the engine to operate under optimal conditions.

Benefits of Using an Original Mercedes Fuel Line

Using an original fuel line in the OM642 engine helps maintain factory safety and reliability standards. The component has been designed specifically for the fuel system, resulting in:

• correct fuel delivery under the appropriate pressure,
• a stable connection with other system components,
• reduced risk of leaks and pressure drops,
• easier diagnostics and future servicing.

For the user, this translates to more predictable operation and a lower risk of fuel system failures, which is particularly important in modern diesel engines.

Condition, Fitment, and Installation

The offered fuel line is a used part, allowing for economical repair while maintaining the original manufacturer's specifications. Due to its original origin, the line retains the correct mounting points and a shape tailored to the W204 engine bay with the OM642 unit.

Before installation, a standard inspection of the fuel system is recommended, including the condition of connections, seals, and other lines, to ensure the integrity of the entire system. A properly selected and installed fuel line supports smooth engine operation and correct starting and acceleration parameters.

Selection by Make and Category

When servicing the fuel system in Mercedes vehicles, it is advisable to consistently use components from the same design group to maintain material and dimensional compatibility. If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and require other parts from the same group, such as return lines, supply sections, or flexible fuel hoses, check the available parts in the Mercedes Hoses, Pipes and Tubes category.

Technical Support and Expert Knowledge

When working with the fuel system, especially in modern diesel engines, correct component selection and adherence to installation procedures are crucial. For more complex repairs, including control electronics, it is beneficial to seek practical advice on selecting and installing used components – you can find this in the article Used Automotive Electronics Onboard – Why Choose Second-Hand ECUs and Sensors?, which discusses issues such as compatibility, OEM markings, and best service practices.