Ford Focus Mk2 Fuel Pump Sender Tank Unit Level Sensor 2.0 TDCI 3M51-9275-AJ

Ford Focus Mk2 Fuel Pump Sender Tank Unit Level Sensor is an original component from the Fuel pumps and level sensors group, designed for the fuel system in second-generation Ford Focus models with a 2.0 TDCI engine. This used OEM part ensures a factory fit, proper integration with the electrical system, and accurate fuel level readings in the tank.

Specifications and technical data

• SKU: 3M51-9275-AJ
• Mark: Ford
• Condition: Used
• OEM Part Number: 3M51-9275-AJ
• Substitutable numbers: 1447513, 3M51-9275-AJ, 3M519275AJ
• Part type: Fuel Pump
• Category: Fuel Pumps & Sending Units

Purpose and function in the fuel system

The presented fuel level sensor and pump unit assembly is responsible for precise measurement of the fuel quantity in the tank and stable fuel supply in the 2.0 TDCI diesel engine. A properly functioning module allows for:

• reliable fuel level indications on the instrument cluster,
• efficient operation of the fuel supply system under typical operating conditions,
• reduced risk of air entering the system when fuel levels are low.

Choosing an OEM component for a specific version of the Ford Focus Mk2 minimizes the risk of electrical and mechanical compatibility issues.

Construction of the pump and level sensor assembly

The module combines fuel supply and fuel level measurement functions in a single housing. In the typical configuration for the Focus Mk2, it includes:

• a body mounted in the fuel tank,
• a float assembly responsible for changing the signal depending on the fuel level,
• components supplying the fuel system in the engine bay,
• an electrical connector matched to the Ford wiring harness.

This design ensures stable operation of the fuel system and consistency with the vehicle's factory control systems.

Benefits of using an original Ford component

Choosing an original module from the Fuel pumps and level sensors group for the Ford Focus Mk2 translates into a number of practical advantages:

• factory fitment to the fuel tank and body mounts,
• sensor characteristics compatible with the instrument cluster and ECU software,
• no need for modifications to the electrical or fuel system,
• preservation of the operating parameters for the 2.0 TDCI engine as specified by the manufacturer.

For users who want to better understand how the entire fuel supply system works, including selection by OEM number and diagnostic principles, the following article will be helpful: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

Characteristics of the used OEM part

The offered component comes from disassembly and is marked as an original Ford part, which means it retains its factory geometry, mounting points, and electrical parameters. A used component of this type is particularly attractive for maintenance repairs where the following are important:

• compliance with the factory fuel system design,
• no issues with communication with the vehicle's electronics,
• cost-effectiveness compared to new aftermarket replacements.

If you want to consciously compare the advantages of a used OEM part with aftermarket replacements, it is worth reading our guide: 5 reasons why a used OEM part is a better choice than an aftermarket replacement.

System expansion – other elements from the same group

If you are planning a comprehensive repair or upgrade of the fuel system area in your Ford and need other components from the same group, such as in-tank pump modules, fuel level sensors, or complete supply assemblies, check out the available parts in the Ford fuel pumps and level sensors category.