Mercedes R172 W221 Fuel Tank Pump Electric Delivery Unit A2214708294

Mercedes R172 W221 Fuel Tank Pump Electric Delivery Unit is an original electric fuel delivery module designed for the fuel system in selected Mercedes models. As a component from the Fuel pumps and level sensors category, it is responsible for the stable delivery of fuel from the tank to the engine and for working in conjunction with the fuel level measurement system.

Specifications and technical data

• SKU: A2214708294
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2214708294
• Substitutable numbers: A2214708294, A 221 470 82 94
• Category: Fuel Pumps & Sending Units

Purpose and function in the fuel system

The presented electric fuel tank pump operates as an integrated delivery module, ensuring appropriate pressure and supply efficiency for the engine unit. Placed directly in the fuel tank, it is responsible for:

• continuous fuel suction from various levels of the tank,
• stable fuel delivery to the rest of the system,
• cooperation with the fuel level sensor in the instrument cluster.

Thanks to a design tailored to the architecture of the Mercedes fuel system, this module helps maintain correct engine operating parameters, reduces the risk of airlocks, and supports smooth operation across the full load range.

Advantages of using an original Mercedes module

Using an original fuel pump module in Mercedes vehicles translates into a number of practical operational benefits:

• Factory fit – geometry, fuel connections, and electrical connectors are consistent with the vehicle's installation, which facilitates assembly and reduces the risk of leaks.
• Stable operating parameters – proper efficiency and electrical characteristics support the correct operation of the engine control unit and the injection system.
• Compatibility with the fuel level sensor – the module works with the factory gauge, ensuring predictable fuel level readings on the dashboard.

Choosing an original component from this group limits problems typical of replacements, such as unstable fuel pressure, engine malfunctions, or incorrect fuel level readings.

Operational characteristics and installation

The offered fuel tank pump is an electrical component designed for installation inside the fuel tank. The module is prepared for operation in a fuel environment, and its design takes into account requirements regarding tightness, chemical resistance, and operational safety.

When replacing, it is recommended to:

• check the condition of the tank cover seals,
• inspect the electrical installation for voltage drops and ground quality,
• verify the patency of fuel lines and the pre-filter.

This approach allows for fully utilizing the module's potential and reducing the risk of needing to intervene in the fuel system again in the near future.

Product condition and practical application

The item comes from disassembly and is offered as a used part, which is a beneficial solution for users looking for a factory component at a reasonable price. In many cases, using an original used fuel pump is more predictable than installing a low-budget replacement with unknown characteristics.

The module will work well both for standard replacement of a worn-out pump and for fuel system repairs after a failure, when it is necessary to restore proper engine power supply and cooperation with the fuel level sensor.

Technical support and additional information

To better understand the role of this type of module in the entire fuel supply system, it is worth reading the guide describing diagnostics, selection by catalog numbers, and the principles of operation and regeneration of fuel system components – details can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

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