Audi A4 B8 A5 8T A8 4H Diesel Fuel Tank Filler Cap Screw 3AA201553

Audi A4 B8 A5 8T A8 4H Diesel Fuel Tank Filler Cap Screw is an original component from the Fuel tanks and filler pipes group, 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 helps maintain the appropriate level of vehicle operational safety.

Specifications and technical data

• SKU: 3AA201553-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 3AA201553
• Substitutable numbers: 3AA201553, 3AA 201 553
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Purpose and function of the fuel tank filler cap

The presented cap is a component of the fuel supply system in Audi vehicles running on Diesel fuel. Its task is to tightly close the filler neck, limit diesel fuel evaporation, and protect the interior of the tank from external contaminants. A properly selected cap helps maintain stable pressure conditions in the tank, which is important for the operation of the fuel pump and the entire supply system.

Compatibility with Audi models

The model described as Audi A4 B8 A5 8T A8 4H Diesel Fuel Tank Filler Cap Screw has been designed for specific generations of the Audi A4, A5, and A8. As a result, the user receives a component structurally matched to the factory fuel filler, which facilitates installation and minimizes the risk of leaks. The cap comes from the Audi brand range, which helps maintain consistency with the vehicle's original fuel system.

Technical and functional characteristics

As a part from the Fuel tanks and filler pipes group, the cap works directly with the filler neck and the fuel tank. The design intended for diesel fuel takes into account the properties of this fuel, including its density, odor, and evaporation method. Properly selected materials and sealing geometry help limit the escape of vapors and the ingress of moisture and dirt into the tank. The component is intended for reinstallation in the vehicle, replacing a worn or damaged cap. Proper fitment to the filler socket allows for secure tightening and comfortable handling during daily refueling.

Condition and advantages of using a used part

The cap is offered as a used part, which allows for reducing the cost of fuel system repairs while maintaining the manufacturer's original specifications. Choosing such a solution is particularly beneficial for vehicles used on a daily basis, where a reasonable balance between price and functionality is important. A used original component often provides a better fit than cheap replacements of unknown origin. Before installation, it is recommended to perform a standard visual inspection of the seals and the locking mechanism to confirm that the cap meets the user's requirements regarding tightness and ease of use.

Service recommendations and additional materials

When replacing the fuel filler cap, it is worth paying attention to the general condition of the filler neck and the upper part of the tank to avoid recurring problems related to leaks or the ingress of contaminants. For vehicles with higher mileage, it is a good solution to simultaneously check the fuel lines and components responsible for tank ventilation. If you are planning a comprehensive repair or upgrade of the fuel supply area in your Audi and need other components from the same group, such as filler necks, supply lines, or mounting elements, check the available parts in the Audi fuel tanks and filler pipes category. To better understand the impact of the condition of fuel system components on diesel engine performance and repair costs, it is worth reading the guide on selecting used components – you will find practical tips in the article Fuel dosing problems – how to safely choose used fuel system components.