Audi A4 B8 Fuel Filler Cap Tank Cap Screw Black Diesel Engine 3AA201553C

Audi A4 B8 Fuel Filler Cap Tank Cap Screw Black Diesel Engine is an original component from the Fuel filler caps and accessories group, designed for diesel fuel systems. It ensures a tight seal for the tank neck, stabilizing the fuel system's operation and reducing fuel evaporation. This is a practical solution for Audi users who need a proven, factory-grade component for daily use.

Specifications and technical data

• SKU: 3AA201553C-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 3AA201553C
• Substitutable numbers: 3AA201553C, 3AA 201 553 C
• Fuel type: Diesel
• Category: Fuel Flaps & Components

Purpose and technical function

The presented cap is dedicated to Audi vehicles with a diesel engine, where maintaining proper fuel system integrity is crucial. The design, adapted for Diesel fuel, helps maintain the correct pressure in the tank and prevents contaminants from entering the system.

The black fuel filler cap is a wear-and-tear component that, if worn or damaged, should be replaced with an original equivalent to avoid issues with tank venting, fuel odors around the car, or errors related to the fuel supply system.

Construction and fitment for Audi A4 B8

The cap has been designed for a precise fit with the filler neck in the Audi A4 B8 generation. The carefully selected geometry of the component allows for secure tightening and consistent closing without the risk of cross-threading or accidental loosening while driving.

Its factory origin translates into:

• compatibility with the original fuel filler neck,
• proper interaction with the tank ventilation system,
• maintaining a consistent exterior appearance of the fuel filler area.

Benefits of using an original fuel filler cap

Using an original fuel filler cap in an Audi offers a range of practical operational benefits. Maintaining a tight seal reduces the risk of moisture and dirt entering the tank neck, which is particularly important for modern diesel fuel systems that are sensitive to contamination.

Key advantages include:

• stable fuel system operation thanks to proper filler sealing,
• reduced risk of leaks and fuel odors around the vehicle,
• preservation of the factory quality standard characteristic of the Audi brand.

Condition and practical application

The item comes from disassembly and is offered as a used part, allowing for an economical replacement while maintaining the manufacturer's original specifications. This solution is particularly beneficial for routine repairs when the existing cap has suffered mechanical damage or wear.

Replacing the fuel filler cap is a simple service task, and using an original component helps avoid problems typical of aftermarket replacements with uncertain fitment, such as difficulty tightening or improper tank ventilation operation.

Additional technical information and resources

To better understand the role of the fuel filler cap in the entire fuel supply system, it is worth checking out our guide on the diagnostics and maintenance of fuel system components. A detailed discussion of the tank, pumps, and injectors can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which facilitates part selection by OEM numbers and provides tips on how to care for a diesel engine's fuel system.

If you are planning a comprehensive repair or upgrade of the fuel filler area in your Audi and need other items from the same group, such as additional covers, accessory guards, or mounting elements, check out the available parts in the Audi fuel filler caps and accessories category.