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

Fuel Injection Line Mercedes W164 W204 W221 OM642 Pressure Pipe Rail Injector is an original fuel system component designed for Mercedes diesel engines from the OM642 family. This used part from the Lines, hoses and pipes category ensures proper fuel flow and stable engine operation, providing a functional service solution for demanding users.

Specifications and technical data

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

Purpose and role in the fuel system

The described fuel line is a component of the diesel engine fuel system, responsible for the safe transport of diesel fuel between system components. For OM642 units, the correct selection of the line is crucial for maintaining proper pressure and sealing, which translates into smooth engine operation, correct fuel dosing, and reduced risk of leaks.

Thanks to a design tailored to the specific engine architecture, the line ensures proper routing of the working medium, minimizing stress and vibrations. This is a particularly important solution in modern diesel units, where the fuel system operates under significant load.

Benefits of using an original Mercedes line

Using an original fuel line in an OM642 engine allows for maintaining the factory fuel routing geometry and compatibility with other system components. In practice, this means:

• secure fitment to mounts and connectors in the engine bay,
• maintenance of the fuel flow path intended by the manufacturer,
• reduced risk of incorrect installation compared to universal replacements,
• stable operation of the fuel system under typical operating conditions.

The used original component represents a reasonable compromise between cost and functionality, especially for maintenance repairs in older vehicle models. By choosing such a component, you can maintain the structural integrity of the fuel system without the need to invest in a new part.

Technical characteristics and fitment for Diesel engines

The line has been designed to work with a Diesel engine, which means it is adapted to the specifics of diesel fuel and the operating conditions characteristic of compression-ignition units. The materials and cross-section of the line are selected to ensure adequate fuel flow and resistance to typical thermal and mechanical loads occurring in the engine bay.

As a result, the line can be used as a replacement part during standard service work, such as fixing leaks, upgrading a section of the fuel system, or restoring functionality after workshop interventions. Proper fitment to the specific engine configuration reduces the need for modifications and shortens installation time.

Condition, service application and practical aspects

The item is offered as a used part, which makes it an attractive solution for optimizing repair costs, especially in vehicles used intensively. This type of component can be used both when replacing a damaged line and when restoring the completeness of the fuel system after previous modifications.

Before installation, it is recommended to perform a standard verification of tightness and the condition of the connectors, in accordance with service procedures used in diesel engine fuel systems. A properly installed line supports stable engine operation and reduces the risk of fuel leaks at critical points of the installation.

System expansion and related components

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 additional fuel lines, return hoses, or supply pipes, check the available parts in the Mercedes lines, hoses and pipes category.

When planning broader service work, it is also worth considering the use of proven recycled components in other vehicle systems. You can find more about the safe selection of used parts and optimizing repair costs in the article Brake calipers under the microscope – how to lower brake system repair costs by choosing proven recycled parts.