Audi Q3 8U Petrol CULB 2.0 TFSI Fuel Pump Sender Tank Left N/S 5N0919109F

Audi Q3 8U Petrol CULB 2.0 TFSI Fuel Pump Sender Tank Left N/S is a component from the Fuel pumps and level sensors group, designed for the fuel supply system of a petrol engine. The integrated pump and float module is responsible for stable fuel delivery and precise level readings, which translates into reliable engine performance and accurate indications on the instrument cluster. This solution allows for restoring the proper operation of the fuel system without the need for a costly replacement of the entire tank.

Specifications and technical data

• SKU: 5N0919109F
• Mark: Audi
• Condition: Used
• OEM Part Number: 5N0919109F
• Substitutable numbers: 5N0919109F, 5N0 919 109 F
• Location on the vehicle: Left
• Fuel type: Petrol
• Category: Fuel Pumps & Sending Units

Purpose and function in the fuel system

The presented fuel pump module with a float has been designed to operate in a petrol engine fuel system, where it is responsible for maintaining the correct fuel pressure and the continuity of its delivery to the fuel rail. The integrated fuel level sensor, based on a float, sends a signal to the vehicle's electronics, enabling reliable readings on the dashboard. Thanks to this, the driver has constant control over the fuel quantity, and the engine control unit receives consistent data to optimize the engine's operation.

Module construction and placement in the vehicle

The fuel pump with a float is mounted on the left side of the tank, which is important from the point of view of the tank's geometry and the routing of fuel lines and the electrical harness. Such placement ensures proper immersion of the pump basket in the fuel and correct operation of the float across the full range of levels – from reserve to a full tank. The module's design provides separate ports for fuel supply and return, as well as an electrical connector for powering the pump motor and the signal path of the level sensor.

Benefits of using an original Audi component

Using a component from the Audi group allows for maintaining the factory operating parameters of the fuel system, including the pump's performance characteristics and the scaling of the fuel level sensor signal. Thanks to this:

• the injection system receives a stable fuel supply under full load range,
• fuel level readings are consistent with the factory gauge scale,
• the engine control unit does not require additional adaptation regarding the pump's characteristics.

This solution is particularly beneficial for repairs of vehicles used on a daily basis, where predictable car behavior and limiting the risk of starting problems or engine misfiring are important.

Operating characteristics in a petrol engine

The module has been prepared to work with a petrol engine fuel system, where a sufficiently high and stable fuel pressure is required. The pump operates submerged, using fuel as a cooling and lubricating medium, which promotes the component's durability. The integrated float is calibrated to work in the tank used in the Audi Q3 8U, which minimizes the risk of false fuel level readings and unwanted needle fluctuations while driving.

Practical installation tips and part selection

When selecting a fuel pump with a float for an Audi Q3 8U, it is worth paying attention to the compatibility with the vehicle's fuel system and the type of petrol engine used. It is recommended to compare the design of the basket, fuel and electrical connectors with the removed component to ensure a plug-and-play installation without the need for system modifications. A properly selected module allows for shortening repair time and limiting the risk of leaks or fuel level reading errors.

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

For users who want to better understand the principles of selecting components from the power supply and vehicle performance measurement group, a guide on our blog may be helpful – Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?, where issues of compatibility, identification by markings, and practical installation tips are discussed.