Mercedes-Benz C CLK Class W203 C209 Diesel Fuel Pump Sender Unit A2034703394

Mercedes-Benz C CLK Class W203 C209 Diesel Fuel Pump Sender Unit is an original fuel system component designed for diesel engines, specifically engineered for the W203 and C209 generation C-Class models. Thanks to its factory design, it ensures stable fuel delivery and proper integration with diesel engine components, which translates into reliable starting and smooth operation of the powertrain. This is a solution for users who are looking for a part that meets the manufacturer's requirements and want to maintain the integrity of the entire fuel system.

Specifications and technical data

• SKU: A2034703394
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2034703394
• Substitutable numbers: A2034703394, A 203 470 33 94, A2034707394, A 203 470 73 94
• Fuel type: Diesel
• Category: Fuel Pumps & Sending Units

Purpose and role in the fuel system

The described pump belongs to the Fuel pumps and level sensors category, responsible for delivering the correct amount of diesel fuel to the engine and working with the fuel level measurement system in the tank. For diesel units, it is crucial to maintain proper pressure and flow continuity so that the injection system can operate under stable conditions.

In practice, this means that a properly selected fuel pump:

• supports smooth diesel engine operation across the full load range,
• reduces the risk of air entering the fuel system,
• facilitates cold starts and starting after long periods of inactivity,
• ensures parameter consistency with the vehicle's factory configuration.

Compatibility and selection by part numbers

The component was designed by the Mercedes brand with specific body and engine variants in mind, which facilitates matching it to the factory fuel installation. The pump has a dedicated OEM part number and associated interchangeable numbers, allowing it to be precisely verified for compatibility with a given vehicle.

When selecting, it is recommended to:

• check the OEM part number in the vehicle documentation or on the old pump,
• verify interchangeable numbers in the manufacturer's catalog or based on the VIN,
• compare the fuel type – in this case, it is a diesel engine, which is significant for the operating characteristics of the fuel system.

Performance characteristics and installation

The fuel pump in this configuration is a component intended for reinstallation in the fuel system, maintaining the factory routing of lines and original mounting points. Thanks to a design consistent with the manufacturer's solutions, it is possible to maintain:

• correct positioning relative to the fuel tank and lines,
• proper cooperation with the fuel level sensor,
• compatibility with the factory electrical harness.

The condition described as used means that the component comes from dismantling and is intended for users who are looking for a cost-effective solution while maintaining the original design. This is a frequently chosen option for maintenance repairs when the priority is matching a specific model rather than modifying the system.

Benefits of using an original diesel pump

Using a fuel pump dedicated to the diesel engine in a Mercedes W203/C209 allows for maintaining operating parameters close to factory specifications. The main advantages of such a solution include:

• consistency with the factory fuel system design – no need for installation modifications,
• preservation of the operating characteristics intended for the diesel unit,
• easier diagnostics in the future due to compliance with service documentation,
• the ability to use existing Mercedes assembly and service procedures.

If you are planning a comprehensive repair or upgrade of the fuel system area in your Mercedes and need other components from the same group, such as additional pumps, power modules, or fuel level sensors, check the available parts in the Mercedes fuel pumps and level sensors category.

Technical support and knowledge about used components

When choosing used fuel system components, such as fuel pumps or sensors, it is worth using reliable sources of information regarding selection by OEM numbers, interpretation of markings, and installation principles. Practical tips on how to safely use second-hand electronics and accessories can be found in the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.