Mercedes W221 Fuel Pump Sender Delivery Unit OM629 OM642 Diesel A2214702094

Mercedes W221 Fuel Pump Tank Pump OM629 OM642 Diesel is an original component of the diesel fuel supply system, designed for OM629 and OM642 diesel engines. The pump operates within the fuel tank, ensuring stable engine supply and proper cooperation with the injection system. This solution is dedicated to users expecting factory fitment and predictable operating parameters.

Specifications and technical data

• SKU: A2214702094
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2214702094
• Substitutable numbers: A2214702094, A 221 470 20 94
• Fuel type: Diesel
• Category: Fuel Pumps & Sending Units

Application and Function in the Fuel System

The fuel pump installed in the tank of the Mercedes S-Class W221 model is responsible for transporting diesel fuel from the tank to other fuel system components. In OM629 and OM642 diesel engines, stable pressure and appropriate fuel flow are crucial for the correct operation of injectors, engine smoothness, and reducing the risk of air entering the system.

This component, categorized under Fuel Pumps and Level Sensors, works with the vehicle's electronics to ensure proper fuel delivery under various load conditions. A correctly selected pump minimizes starting problems, power drops, and uneven engine operation at low fuel levels.

Benefits of Using an Original Mercedes Pump

Choosing a fuel pump dedicated to the W221 diesel engines offers a range of practical benefits:

• Factory Fitment – construction compliant with vehicle manufacturer's requirements, without the need for installation modifications.
• Consistent cooperation with the injection system of OM629 and OM642 engines, promoting stable engine operating parameters.
• Appropriate fuel flow characteristics for diesel engines, adapted to the specifics of the common rail system.
• Reduced risk of leaks and bleeding issues compared to generic aftermarket replacements.

A used original part represents a sensible compromise between cost and quality – especially for advanced diesel systems where the precision of the fuel pump's operation directly impacts injector durability and driving comfort.

Selection by OEM Number and Compatibility

The fuel pump for the Mercedes W221 should always be selected based on the OEM number and engine code to ensure full compatibility with the vehicle's fuel and electrical systems. In practice, this means matching:

• to the specific W221 body generation,
• to the type of diesel engine,
• to the factory-installed fuel system configuration.

Before purchasing, it is advisable to verify compatibility using the part number or vehicle VIN, which minimizes the risk of installing a component with different operating characteristics. This ensures the pump maintains proper performance parameters and works correctly with the control electronics.

Condition, Installation, and Operation

The offered fuel pump is a used component, which for original Mercedes parts often allows for a favorable price-to-quality ratio. Before installation, standard service procedures are recommended: checking the fuel system, the condition of the lines, and the cleanliness of the tank, so that the newly installed component operates under the best possible conditions.

Professional installation at a specialized workshop facilitates maintaining system tightness and correct electrical connections. A properly selected and installed tank pump in a W221 diesel engine translates to more reliable starting, stable idling, and predictable performance across the entire RPM range.

More Solutions and Technical Knowledge

If you are looking for other Mercedes Fuel Pumps and Level Sensors, check out the Mercedes Fuel Pumps and Level Sensors available in our store to select components perfectly matched to your specific model and engine version.

When selecting and installing fuel system components and electronics, our guide on used modules and sensors may be helpful – you will find more practical tips in the article “Used Automotive Electronics Onboard – Why Choose Second-Hand ECUs and Sensors?”, where we discuss, among other things, selection by OEM numbers, compatibility issues, and common user questions.

Additional information on safely purchasing used components online, including fuel system parts, can also be found in the step-by-step guide “Safe Online Purchase of Used Car Parts – A Step-by-Step Guide”, which helps to structure the part verification process before finalizing an order.