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

Fuel Pump Mercedes W204 W207 W212 OM642 Diesel High Pressure Pump is a component from the High-pressure fuel pumps category, designed for OM642 diesel engines used in popular Mercedes C-Class, E-Class, and CLK models. This is a solution for users looking for a technically matched component for the diesel fuel supply system, maintaining the factory operating characteristics of the engine.

Specifications and technical data

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

Purpose and role in the fuel system

The offered injection pump operates in the high-pressure diesel supply system of the OM642 engine, responsible for precisely delivering fuel to the rail and injectors. It is a key component for the stable operation of the engine, proper starting, and maintaining correct combustion parameters in Mercedes W204, W207, and W212 series vehicles.

The selection of the pump for a specific vehicle version should always be verified by the OEM number or interchangeable numbers in the technical specification, which helps avoid compatibility issues and ensures proper cooperation with the control electronics.

Benefits of using an original high-pressure pump

Using a pump from the High-pressure fuel pumps group dedicated to the OM642 engine allows for maintaining the factory parameters of the fuel system. In practice, this means:

• stable pressure in the common rail throughout the entire load range,
• smoother engine operation at idle,
• correct fuel dosage during acceleration and under load,
• reduced risk of engine control unit errors related to fuel pressure.

For the user, this translates into more predictable operation, better engine refinement, and the possibility of further fuel system diagnostics based on factory reference values.

Technical characteristics and compatibility

The injection pump is designed to work with Diesel fuel, in accordance with the design of the OM642 engine. It works with the common rail system, where maintaining the appropriate operating pressure and the tightness of the entire fuel path is crucial. By being assigned to a specific family of engines, the pump is structurally adapted to:

• the mounting geometry on the OM642 engine,
• fuel supply and return connections,
• engine control unit requirements regarding pressure regulation.

Before installation, it is recommended to verify compatibility with the vehicle based on catalog data and the numbers visible in the specification section to ensure full compliance with the given Mercedes version.

Product condition and installation recommendations

The offered pump belongs to the group of used parts, which allows for an economical restoration of the fuel system efficiency in the vehicle while maintaining the original design. Before installation, it is worth performing standard service activities, such as checking the cleanliness of the fuel system, filters, and lines, to minimize the risk of contaminants entering the pump.

Installation in a specialized workshop is recommended, as they have the appropriate facilities to bleed the system, verify pressure parameters, and perform any necessary adaptation in the engine control unit after replacing the component.

Technical support and additional materials

To better understand the operation of the fuel supply system in diesel engines, how to select a pump by OEM number, and basic diagnostic procedures, it is worth reading the article: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. You will find practical tips there regarding the operation and regeneration of fuel system components.

If you are considering whether a new or used part is a better choice in your case, the following guide may be helpful: Car parts – new or used? We compare costs, quality, and durability, which discusses the differences in costs, durability, and availability of 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 pumps, supply elements, or components working with the common rail system, check the available parts in the Mercedes High-pressure fuel pumps category.