Audi Q5 8R Fuel Tank Filler Screw Fuel Cap Cover Diesel 8K0201550B

Audi Q5 8R Fuel Tank Filler Screw Fuel Cap Cover Diesel is an original refueling system component designed for Audi vehicles with diesel engines. It ensures a tight seal of the filler neck, stabilizes the operating conditions of the fuel system, and prevents contaminants from entering the tank. This is a practical service solution for users who want to restore proper fuel filler operation after damage or wear of the factory cap.

Specifications and technical data

• SKU: 8K0201550B
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0201550B
• Substitutable numbers: 8K0201550B, 8K0 201 550 B
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Purpose and function in the fuel system

The presented cap is a component from the Fuel tanks and filler pipes group, responsible for securely closing the filler neck in diesel-powered Audi cars. Its task is to maintain proper sealing, which helps reduce fuel evaporation, protects against water and dirt entering the tank, and supports stable fuel system operation during daily use.

Thanks to its dedicated design for Diesel units, the cap works with the operating conditions characteristic of diesel engines, such as different fuel vapor composition or specific requirements regarding tightness and refueling safety.

Benefits of using an original Audi cap

Using an original fuel filler cap in an Audi Q5 8R allows you to maintain the factory parameters of the refueling system. A properly selected component:

• ensures a fit to the filler neck without the need for modifications,
• maintains proper sealing and reduces the risk of contaminants entering the tank,
• supports the correct operation of the fuel tank ventilation system,
• minimizes the risk of error messages related to fuel system leaks.

For the user, this means stable, predictable fuel filler operation and compliance with the vehicle's factory design.

Product characteristics and condition

The offered fuel filler cap is a used item, sourced from dismantling, which provides a cost-effective solution while maintaining the manufacturer's original specifications. This type of part is particularly useful in situations where there has been mechanical damage to the cap, wear of the seals, or problems with closing the filler flap.

Thanks to the preservation of factory geometry and construction, the cap can be used as a direct replacement for a damaged element, without the need for modifying the filler neck or additional adaptations within the fuel system.

Selection by numbers and integration with the fuel system

The product belongs to a group of elements that, in service practice, are selected based on the manufacturer's catalog data, such as part numbers or interchangeable numbers. This allows for verifying compatibility with a specific version of the Audi Q5 8R and other models where the manufacturer intended the use of the same design solution within the fuel filler area.

A properly selected cap works with the existing filler neck, hoses, and fuel tank, maintaining the parameters intended for the diesel fuel system. This is important both for refueling safety and for the long-term, stable operation of the entire fuel system.

Technical support and educational materials

If you want to better understand how the fuel filler cap fits into the operation of the entire fuel supply system, including the role of the tank, pumps, and injectors, it is worth consulting specialized resources. A practical discussion on diagnostics, selecting parts by numbers, and operating principles can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which helps organize service knowledge and facilitates informed component selection.

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 filler necks, fuel supply hoses, or tank mounting elements, check the available parts in the Audi fuel tanks and filler pipes category.