Mercedes W204 C207 W212 High Pressure Fuel Pump 2.1 OM651 A6510702001

Mercedes W204 C207 W212 High Pressure Fuel Pump 2.1 OM651 is a specialized component of the diesel engine fuel supply system, designed for the OM651 diesel engine family. It offers precise high-pressure fuel delivery, which translates into stable engine operation, correct performance, and proper integration with the fuel injection system. This solution is dedicated to users who expect a proven component for professional fuel system repairs.

Specifications and technical data

• SKU: A6510702001
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510702001
• Substitutable numbers: A6510702001, A 651 070 20 01
• Fuel type: Diesel
• Category: Fuel Pumps & Sending Units

Purpose and function in the fuel system

The described high-pressure fuel pump operates within the diesel engine fuel supply system, responsible for generating sufficiently high fuel pressure for the injectors. In OM651 units installed in Mercedes W204, C207, and W212 models, it is a key element ensuring:

• stable pressure in the fuel rail under various engine loads,
• correct fuel metering across the entire RPM range,
• efficient cooperation with the engine control electronics,
• maintenance of proper diesel engine operating standards.

Thanks to its appropriate design, the pump supports efficient diesel combustion, which helps maintain nominal engine performance parameters and reduces the risk of rough idling or starting issues.

Benefits of using a high-pressure fuel pump in a diesel engine

Diesel engines require precise fuel delivery under high pressure. Using a properly selected high-pressure pump in a Common Rail system provides a number of operational benefits:

• more predictable throttle response due to stable fuel pressure,
• reduced risk of power drops resulting from insufficient fuel supply,
• better cooperation with the injection system and engine control unit,
• preservation of the factory operating parameters of the OM651 unit.

A properly selected pump from the Fuel pumps and level sensors group is particularly important in modern diesel units, where fuel system operating tolerances are very narrow, and any deviations quickly translate into diagnostic errors and a decrease in driving comfort.

Vehicle fitment and installation aspects

The high-pressure fuel pump designed for the OM651 engine in Mercedes W204, C207, and W212 models should always be selected based on vehicle data and manufacturer markings. This allows for compliance with the factory fuel system configuration and avoids problems with installation or subsequent calibration. In practice, this means:

• maintaining the correct mounting method to the engine block,
• proper connection of high and low-pressure fuel lines,
• compatibility with the existing control installation and sensors.

When replacing the pump, it is worth ensuring the cleanliness of the fuel system and following service procedures, which minimizes the risk of contaminants entering precision working components.

Characteristics of the used product

The offered pump belongs to the group of used parts, which is an attractive solution for users looking for a compromise between repair costs and maintaining the original fuel system specifications. In the case of components such as a high-pressure fuel pump for a diesel engine, it is particularly important that they come from a reliable source and comply with the vehicle manufacturer's factory requirements. Using an original used component allows for maintaining the structural integrity of the system and limiting the risk of problems resulting from the use of random replacements.

Technical support and additional information

When selecting fuel system components, such as a high-pressure fuel pump for a diesel engine, it is worth using the vehicle identification data and the part manufacturer's markings. This helps avoid incompatibility and ensures proper cooperation with the control electronics. 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 supply pumps, fuel level sensors, or fuel system control modules, check the available parts in the Mercedes Fuel pumps and level sensors category.

If you want to better understand how to select and integrate used components that work with engine electronics, a guide on control modules and sensors may be useful – you can find it in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.

For drivers who pay attention to the long-term value of the vehicle, the issue of the impact of original used parts on the future resale of the car may also be important – you can find more practical tips in the material Original used parts vs. resale value – how not to lose money?.