Mercedes W204 W207 W212 Fuel Pump OM642 Diesel High Pressure Pump A6420700801

Mercedes W204 W207 W212 Fuel Pump OM642 Diesel High Pressure Pump is a specialized fuel system component designed for diesel engines, ensuring stable high-pressure fuel delivery to the fuel rail. This used pump from this series, when properly diagnosed and installed, allows for the effective restoration of the common rail system efficiency in Mercedes vehicles. It is a solution for users who want to combine technical correctness with reasonable repair costs.

Specifications and technical data

• SKU: A6420700801-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420700801
• Substitutable numbers: A6420700801, A 642 070 08 01, 0445010210, 0 445 010 210, A 642 070 10 01, A6420701001, A6420701201, A 642 070 12 01
• Fuel type: Diesel
• Category: High Pressure Fuel Pumps

Application in the OM642 engine and role in the common rail system

The presented high-pressure pump operates in the common rail system of the OM642 engine, responsible for generating sufficiently high fuel pressure for the injectors. Thanks to its precise design, it ensures uniform supply to all cylinders, which translates into stable engine operation, proper performance, and predictable load response.

In diesel engines of this generation, a properly functioning high-pressure pump is crucial for combustion parameters, exhaust emissions, and fuel consumption. Replacing a worn component with a verified, used pump helps reduce the risk of starting problems, power drops, or unstable idle speed.

Technical characteristics and compatibility

The pump belongs to the High-pressure fuel pumps group and is designed to work with Diesel fuel. The construction is adapted to the requirements of Mercedes injection systems, which facilitates integration with the factory fuel installation and engine management.

To facilitate selection, the part has a dedicated OEM number and a set of interchangeable numbers, which allows for precise matching to a specific vehicle configuration. In practice, this means the possibility of verifying compatibility by part number, service documentation, or manufacturer catalogs, without the need for installation interference or mechanical adaptation.

Benefits of installing a used high-pressure pump

Choosing a used high-pressure pump for a Mercedes with an OM642 engine is a solution often used in professional workshops, especially when repairing vehicles that are used intensively. The main advantages of this solution include:

• the ability to restore correct pressure in the common rail without investing in a brand-new component,
• maintaining the original operating characteristics of the Mercedes fuel system,
• easier diagnostics in case of further service work thanks to compliance with factory parameters,
• reducing total repair costs while maintaining high system functionality.

Before installation, it is recommended to perform basic fuel system diagnostics (checking pressure, leaks, and fuel filter condition) to fully utilize the potential of this pump and avoid secondary failures resulting from contamination or problems in other installation components.

Selection by numbers and technical support

To correctly select the pump for a specific Mercedes model, it is worth using the OEM part number and interchangeable numbers assigned to this model. This helps avoid ordering errors and ensures compatibility with the given engine version, controller software, and equipment.

If you want to deepen your knowledge about diagnostics and operation of the fuel system, practical procedures for checking pressure, selecting components by VIN or part numbers, and regeneration principles, use the guide material: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. This is a useful source of information for both users and workshops.

Mercedes high-pressure fuel pumps – expansion and modernization

If you are planning a comprehensive repair or modernization of the engine area in your Mercedes and need other elements from the same group, such as additional pumps, power supply elements, or components supporting the injection system, check the available parts in the Mercedes high-pressure fuel pumps category.

Summary

Mercedes W204 W207 W212 Fuel Pump OM642 Diesel High Pressure Pump is a practical solution for users and service centers that want to restore the efficiency of the fuel system in a diesel engine while maintaining compliance with the manufacturer's factory specifications. A properly selected and installed pump supports stable engine operation, improves starting quality, and reduces the risk of typical failures associated with improper fuel pressure in the common rail system.