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

Mercedes W164 W204 W221 Fuel Injection Line Injector Pressure Pipe Set OM642 is a set of original fuel system components designed for Mercedes diesel engines. The set ensures stable high-pressure fuel delivery to the injectors, which translates into smooth engine operation and predictable performance. This solution is particularly beneficial when servicing the common rail system in vehicles with the OM642 engine.

Specifications and technical data

• SKU: A6420700800-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420700800
• Substitutable numbers: A6420700800, A 642 070 08 00, A6420700033, A 642 070 00 33, A6420701433, A 642 070 14 33
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The injector pressure pipe set is responsible for the precise delivery of fuel to each cylinder in a diesel engine. In OM642 units, the proper condition of the pipes is crucial for:

• maintaining stable pressure in the common rail,
• correct fuel dosing by the injectors,
• reducing power drops and rough idling,
• minimizing the risk of fuel leaks in the engine bay.

By using a complete set of pipes, you minimize the risk of point leaks and differences in the characteristics of individual system sections, which is particularly important in modern diesel engines.

Compatibility with the OM642 engine and Mercedes vehicles

The presented set has been designed to work with the OM642 diesel engine used in various Mercedes models, such as the W164, W204, or W221 classes. As a result, it provides a coherent service solution for vehicles equipped with this engine, allowing for the maintenance of the factory characteristics of the injection system.

The original origin from the Mercedes group means maintaining the correct pipe geometry, appropriate internal diameters, and fitment to the mounts in the engine bay. This is important both from the point of view of durability and operational safety.

Performance characteristics and advantages of use

Using a complete set of injector pressure pipes in a diesel engine brings a number of practical service and operational benefits:

• consistent fitment of all pipe sections to the specific engine configuration,
• maintaining proper high-pressure fuel delivery,
• reducing the risk of vibrations and stress due to appropriately selected stiffness and shape,
• easier diagnostics of the injection system after replacing components with a uniform set.

The used set from original Mercedes production is a cost-effective solution that is also technically matched to the requirements of the OM642 engine. This allows for a rational repair of the fuel system while maintaining compliance with the factory design.

Professional use in diesel service

This pipe set is intended for workshops and users who expect precise fitment to the injection system in a diesel engine. It works well both when replacing individual injectors and during larger service works related to the fuel system. The Diesel fuel type determines high requirements regarding tightness and pressure resistance, which are met by the pipes in this set.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as return lines, flexible fuel hoses, or metal supply tubes, check the available parts in the Mercedes lines, hoses, and tubes category.

Additional technical information and support

When selecting injection system components, it is worth paying attention to compatibility with the specific engine version and vehicle model year. Manufacturer markings, OEM part numbers, and interchangeable numbers can be helpful, allowing for unambiguous verification of the set's compatibility with a given vehicle.

If you are considering using used components for a wider range of repairs and want to better understand the differences between dismantled parts and replacements, it is worth reading the guide: Accident repair of your car: why are used body parts a better choice than replacements?. Although it mainly concerns bodywork elements, it addresses important issues of quality, fitment, and cost-effectiveness, which are also important when selecting technical components.