BMW F10 Fuel Pump Sender Tank Closing Lock Ring Surround 7845124

The BMW F10 Fuel Pump Sealing Ring for Tank is an original mounting component from the Fuel Pumps and Level Sensors group, designed for use in BMW vehicles. It ensures a stable, sealed fit of the fuel pump module in the tank, contributing to safe and predictable fuel system operation.

Specifications and technical data

• SKU: 7845124
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7845124
• Substitutable numbers: 7845124, 16117845124
• Category: Fuel Pumps & Sending Units

Purpose and Function of the Sealing Ring

The fuel pump sealing ring in the tank is responsible for mechanically pressing the pump basket into its seat in the tank and maintaining the seal of the connection. In practice, this means reducing the risk of leaks at the top of the tank, ensuring a stable position for the pump module, and proper cooperation with the fuel level sensor.

In the BMW F10 design, the ring is a wear item that should be checked for wear every time the fuel pump module is accessed. Using the correct, properly fitted mounting component helps avoid problems with the fuel system after servicing.

Benefits of Using an Original BMW Component

Using a ring from the same production line as factory BMW components results in:

• precise fit to the fuel pump seat in the tank,
• correct distribution of clamping forces on the module's flange,
• stable positioning of the pump and fuel level sensor,
• reduced risk of leaks at the top of the tank.

As a result, the sealing ring is an important component for any intervention in the fuel supply system, especially when replacing the pump or level sensor.

Product Characteristics and Service Application

The presented ring is an original BMW component, sourced from disassembly, which helps maintain the factory geometry and manufacturing standards appropriate for this brand. A used component of this type is often chosen as an economical alternative to a new part, while maintaining dimensional and mounting compatibility.

In practice, the sealing ring is used in situations such as:

• replacement of the fuel pump in the tank,
• servicing or replacement of the fuel level sensor,
• diagnostics of the fuel system requiring removal of the module from the tank,
• repairs after previous damage or incorrect installation of the ring.

Selecting the correct component is based on the part number and compatibility with the specific BMW F10 version, which helps avoid installation and sealing issues.

Technical Support and Selection by Numbers

For components in the Fuel Pumps and Level Sensors group, matching by part numbers and specific model configuration is crucial. When selecting a sealing ring, it is advisable to verify compatibility with the pump module installed in the car and the type of fuel tank to ensure proper clamping and a sealed connection.

If you are planning a comprehensive repair or upgrade of the fuel system area in your BMW and need other components from the same group, such as pump modules, mounting baskets, or fuel level sensors, check the available parts in the BMW Fuel Pumps and Level Sensors category.

Why Consider Used Mounting Components

For mounting components like sealing rings, used original parts often represent a sensible compromise between cost and quality. They retain factory fitment while helping to reduce expenses for major servicing work on the fuel system.

If you want to better understand when choosing used components is technically justified and how to safely select parts by part numbers, it is worth consulting our guide: Used Automotive Electronics Onboard – Why Choose Second-Hand ECUs and Sensors?. Although it primarily concerns electronics, the principles of selection by numbers and compatibility verification described there are also helpful when planning purchases of other used components.