Audi A4 B8 A5 8F A7 4G8 Fuel Filler Cap Diesel Tank Lid Black Cover 3C0201553J

Audi A4 B8 A5 8F A7 4G8 Fuel Filler Cap Diesel Tank Lid Black Cover is an original component from the Fuel filler flaps and caps group, designed for diesel engine fuel systems. Its robust construction and precise fit to the filler neck ensure a tight seal of the fuel system and stable operation of the installation.

Specifications and technical data

• SKU: 3C0201553J-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 3C0201553J
• Substitutable numbers: 3C0201553J, 3C0 201 553 J, 4G0201550D, 4G0 201 550 D
• Fuel type: Diesel
• Part type: Fuel Tank Cap
• Color: Black
• Category: Fuel Tank Caps

Purpose and technical function

The presented cap is dedicated to Audi vehicles equipped with a diesel engine. Its task is to maintain the proper tightness of the filler, limit fuel evaporation, and protect the system against the ingress of external contaminants. As a result, the fuel system operates under stable conditions, which promotes uniform fuel dosing and proper injector performance. The component belongs to the Fuel filler flaps and caps group, which is responsible for the physical protection of the filler neck and maintaining the correct pressure parameters in the tank. The cap is structurally prepared for use with a diesel fuel system, which is important both in terms of material resistance and sealing characteristics.

Construction, color, and fit

The cap is finished in black, allowing for an aesthetic match with most factory fuel filler flaps used in Audi models. The neutral, dark color blends well with both light and dark body paints, ensuring the component does not disrupt the visual consistency of the vehicle. The geometry of the cap has been designed for a specific filler neck, which facilitates installation and ensures a secure fit. The properly selected seal and locking mechanism allow for repeated, reliable tightening without excessive wear, which is important for daily vehicle refueling.

Performance parameters and role in the fuel system

The cap designed for diesel fuel operates in an environment exposed to contact with diesel oil and its vapors, which is why the structural solutions used are focused on chemical resistance and dimensional stability. A properly selected cap helps reduce the risk of moisture and dust entering the filler neck, which indirectly affects the purity of the fuel in the tank. Using the correct fuel filler cap is also important in the context of fuel system diagnostics. Leaks in this area can lead to errors related to tank pressure or incorrect parameter readings by the engine control unit. Selecting a component dedicated to a specific type of fuel is therefore important both from the point of view of operation and subsequent diagnostics. If you want to better understand the relationship between fuel system tightness and the operation of fuel system components, it is worth reading the guide: Fuel dosing problems – how to safely choose used fuel system components.

Condition, origin, and practical application

The offered cap is a used component, which in practice means it comes from vehicle dismantling and has been verified for further operational suitability. This type of solution is often chosen for vehicle maintenance where maintaining the original manufacturer's specification while optimizing repair costs is important. Replacing the fuel filler cap is a simple maintenance task, yet it can solve problems related to filler leaks, the smell of fuel near the flap, or improper operation of the tank ventilation system. It is a practical way to restore the correct operating conditions of the fuel system without interfering with more complex components. If you want to plan repairs using dismantled parts more broadly, the following article may be helpful: how to reasonably choose used components for maintenance repairs.

Complementary items from the same group

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

Summary

Audi A4 B8 A5 8F A7 4G8 Fuel Filler Cap Diesel Tank Lid Black Cover is a functional, original component designed for diesel fuel systems in Audi vehicles. It ensures a tight closure of the filler, protects against contaminants, and supports the stable operation of the fuel system, making it a reasonable choice for service or when replacing a damaged cap.