Fuel Pump Mercedes W204 OM642 Diesel High Pressure Pump A6420700201

The Mercedes W204 OM642 High-Pressure Injection Pump is a component from the High-Pressure Fuel Pumps group, designed for Mercedes diesel engines with the OM642 unit. This used pump offers a functional service solution for vehicles with a Diesel injection system, restoring proper fuel supply at the correct pressure. It's a practical choice for workshops and owners seeking an original design for professional fuel system repair.

Specifications and technical data

• SKU: A6420700201
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420700201
• Substitutable numbers: A6420700201, A 642 070 02 01, 0445010095
• Fuel type: Diesel
• Category: High Pressure Fuel Pumps

Purpose and Role in the Fuel System

The high-pressure pump in the OM642 engine is responsible for generating stable, high fuel pressure in the common rail manifold, which is crucial for precise diesel fuel metering by the injectors. The Mercedes W204 OM642 High-Pressure Injection Pump works in conjunction with the electronic engine control unit, pressure sensors, and the injection system, ensuring optimal operating parameters across the full range of loads and speeds.

Thanks to its design dedicated to Diesel high-pressure units, the pump is adapted to combustion characteristics, operating pressures, and requirements for sealing and resistance to fuel contamination.

Benefits of Using an Original High-Pressure Pump

Using a pump from the High-Pressure Fuel Pumps group, dedicated to a specific engine type, helps reduce the risk of starting problems, power loss, or unstable idling. The original design ensures:

• maintenance of factory common rail pressure parameters,
• proper interaction with injectors and pressure sensors,
• compatibility with the engine control unit software,
• appropriate operating characteristics for Diesel fuel.

For workshops and services specializing in the Mercedes brand, this solution simplifies diagnostics, calibration, and subsequent vehicle operation after repair.

Selection by Part Numbers and Installation Compatibility

The pump belongs to the High-Pressure Fuel Pumps category and is intended for diesel fuel supply systems. Selection is typically based on the OEM part number and interchangeable numbers, allowing verification of compatibility with a specific OM642 engine version and W204 body. In workshop practice, this means the ability to precisely match the component to the vehicle, minimizing the risk of incorrect installation.

A used element of this type is often chosen as an economical alternative to new components, while maintaining the original geometry, mounting points, and fuel connections.

Fuel System Operation and Technical Support

To maximize the potential of the high-pressure pump in a Diesel engine, it's advisable to maintain the condition of the entire fuel system – filtration, lines, injectors, and fuel tank. Detailed information on diagnostics, selection by OEM numbers, and principles of repair and operation can be found in the article: Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair.

Expanding Repairs within the Mercedes Fuel System

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional pumps, supply elements, or components supporting the injection system, check the available parts in the Mercedes High-Pressure Fuel Pumps category.

Summary

The Mercedes W204 OM642 High-Pressure Injection Pump is a practical service solution for diesel engines where stable common rail system operation is crucial. A used, original pump from the dedicated category allows for professional fuel system repair while maintaining compatibility with the original design and factory parameters of the OM642 unit.