Mercedes W164 W203 W211 OM642 High Pressure Fuel Pump A6420700501

The Mercedes W164 W211 OM642 High-Pressure Injection Pump is a component from the Fuel Pumps & Level Sensors category, designed for OM642 diesel engine fuel systems. This solution is for users who expect stable fuel supply, correct injector operation, and preservation of the engine's factory parameters.

Specifications and technical data

• SKU: A6420700501-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420700501
• Substitutable numbers: A6420700501, A 642 070 05 01
• Location on the vehicle: Front
• Fuel type: Diesel
• Category: Fuel Pumps & Sending Units

Purpose and Function in the Fuel System

The high-pressure injection pump in a diesel engine is responsible for generating the appropriate high fuel pressure in the common rail, which is crucial for the correct dosing and atomization of diesel fuel. In OM642 units installed in Mercedes SUV and sedan models, the pump is located at the front of the powertrain, working in conjunction with engine accessories and control electronics.

Selecting a pump compatible with the specific engine version and accessories allows for maintaining:

• stable pressure across the entire load range,
• proper diesel engine running characteristics,
• efficient cooperation with the common rail injection system.

Key Technical Features

The presented pump belongs to the group of components designed for diesel engine fuel supply, integrated with the high-pressure system. The design intended for installation at the front of the powertrain allows for correct power transfer from the engine and easier service access compared to solutions located deeper in the engine bay.

As an original Mercedes part, the pump is designed to work with factory control systems, sensors, and accessories, which reduces the risk of compatibility issues and facilitates diagnostics when needed.

Practical Application and Installation

The high-pressure pump in the OM642 engine significantly impacts starting, dynamics, and fuel consumption. Replacing a worn component with a functional pump from the same design family allows for restoring the correct operating parameters of the injection system, especially in vehicles with higher mileage.

When selecting and installing, it is worth paying attention to:

• compatibility with the specific OM642 engine version,
• proper bleeding of the fuel system after installation,
• checking the condition of high-pressure lines and the common rail.

Professional installation and leak verification of the system after pump installation help avoid starting problems and power loss.

Characteristics as a Used Part

The offered pump is part of the used original parts group, allowing for savings while maintaining the manufacturer's factory specifications. In practice, this means compatibility with the factory fuel system without the need for installation modifications and the possibility of diagnostics using standard service procedures.

More about why used OEM parts are a rational choice in terms of safety and repair costs can be found in the guide: used original car parts OEM – quality assurance and safety.

Technical Support and Selection by Numbers

When selecting a high-pressure injection pump for a specific vehicle, it is crucial to compare manufacturer markings and vehicle data (including engine type and year). This helps avoid mechanical and software compatibility issues and ensures correct cooperation with the engine control system.

If you are interested in other Mercedes Fuel Pumps & Level Sensors, check the available products in the category: Mercedes Fuel Pumps & Level Sensors.

For components that interact with engine electronics, it is also worth familiarizing yourself with the guide on selecting and installing control modules: used car electronics – how to safely select ECU modules and sensors.