Mercedes SLK R172 Fuel Sender Pump Delivery Unit M271 A1724700390

Mercedes SLK R172 Fuel Sender Pump Delivery Unit M271 is an original fuel system component from the Fuel pumps and level sensors category, designed for precise operation with the M271 engine. The use of a complete module with a float ensures stable fuel supply and reliable fuel level readings in the tank, which translates into predictable engine performance and accurate indications on the instrument cluster.

Specifications and technical data

• SKU: A1724700390
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1724700390
• Substitutable numbers: A1724700390, A 172 470 03 90
• Part type: Fuel Pump
• Category: Fuel Pumps & Sending Units

Purpose and function in the fuel system

The described fuel pump module with a float has been designed specifically for Mercedes SLK R172 series models equipped with the M271 engine. Integrating the pump with the fuel level sensor in a single housing ensures consistent operation of the fuel supply and indication systems, reducing the risk of measurement errors and unstable engine operation.

In practice, this means that one component is responsible for both delivering fuel at the correct pressure to the fuel rail and transmitting information about the fuel quantity to the vehicle's electronics. Such a solution facilitates diagnostics, maintenance, and the subsequent operation of the car.

Construction of the fuel pump module with a float

The fuel pump module in this solution includes the part responsible for pumping fuel and an integrated float acting as a level sensor. The float moves along a guide inside the tank, and its position is converted into an electrical signal transmitted to the instrument cluster. Thanks to this, the driver receives clear information about the current fuel status.

The original design used by Mercedes ensures proper fitment to the tank basket, correct electrical connections, and compatibility with the factory fuel system. The use of a dedicated module minimizes the risk of leaks, venting problems, or incorrect fuel suction at low levels in the tank.

Benefits of using an original fuel pump with a float

Choosing a complete fuel pump module with a level sensor instead of makeshift repairs allows you to maintain the factory parameters of the fuel system. Key advantages of this solution include:

• consistent cooperation of the pump with the vehicle's electronics and fuel gauge,
• proper fitment to the tank and factory wiring harness,
• reduced risk of starting problems and engine misfiring at low fuel levels,
• easier diagnostics in case of potential future faults.

For the user, this means more stable engine operation, predictable car behavior in daily use, and a reduction in unplanned service downtime.

Component condition and practical application

The presented module comes from a Mercedes vehicle and is offered as a used part, which is an attractive cost-effective solution while maintaining the factory design. This type of component is particularly useful for:

• fuel system repairs after a fuel pump failure,
• problems with incorrect fuel level indications,
• comprehensive fuel tank maintenance after its removal or cleaning.

Using an original module from the same model family allows for reduced installation time and avoids the need for system modifications, which is important for both workshops and individual users.

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

Expert support when choosing used components

When selecting a used fuel pump module with a float, it is worth paying attention to compatibility with the specific engine version and the vehicle's electrical system. Experience with other electronic components and accessories can be helpful, where proper fitment is crucial for the trouble-free operation of the system.

To better understand when choosing used components is a reasonable solution and what to look for when purchasing them, check out our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.