Volkswagen VW Golf Mk5 Mk6 Fuel Tank Cap Screw TDI Diesel 1K0201550AG

Volkswagen VW Golf Mk5 Mk6 Fuel Tank Cap Screw is an original component from the Fuel filler flaps and caps group, designed for diesel fuel systems. It ensures a tight seal of the filler neck, stabilizes the operating conditions of the fuel system, and helps maintain safe vehicle operation in daily use.

Specifications and technical data

• SKU: 1K0201550AG
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 1K0201550AG
• Substitutable numbers: 1K0201550AG, 1K0 201 550 AG
• Fuel type: Diesel
• Part type: Fuel Tank Cap
• Category: Fuel Tank Caps

Purpose and technical function

The presented cap is dedicated to Volkswagen Golf Mk5 and Golf Mk6 models with diesel engines. Its task is to provide a controlled, airtight seal of the filler neck, which limits fuel evaporation, protects against contaminants entering the tank, and supports the proper operation of the venting system. The design is adapted to the specifics of Diesel fuel, which is important for both safety and the durability of the component.

Construction and fitment to the fuel system

The cap is designed to be mounted directly into the factory fuel filler housing, maintaining the correct sealing profile and ergonomic grip. The properly selected thread geometry and the shape of the working part allow for secure tightening and repeatable closing, which is important during frequent refueling. The applied design solutions are consistent with the manufacturer's standards, so the cap works with the original filler flap and does not require any modifications to the housing.

Condition of the component and practical aspects

The offered cap comes from disassembly and is sold as a used part, which is a favorable compromise between cost and functionality. Such an element, while maintaining the efficiency of the locking mechanism and an intact sealing zone, can still effectively fulfill its role in the fuel system. Replacing a worn or damaged cap with a functional one allows you to reduce the risk of water, dirt, or dust entering the tank, as well as reduce the likelihood of error messages related to system leaks.

Benefits of using a dedicated fuel tank cap

Using the correct fuel tank cap in a diesel vehicle translates into several practical benefits:

• maintaining the tightness of the fuel system in the filler area,
• protection against external contaminants,
• stable operating conditions for the tank and associated components,
• maintaining proper operation of the refueling zone in the Golf Mk5/Mk6.

For the user, this means more predictable operation, a lower risk of fuel supply problems, and no need to use universal, ill-fitting solutions. Choosing an original cap from this product group is particularly important in vehicles that are heavily used, where the fuel system operates in diverse environmental conditions.

Integration with the fuel system and service knowledge

Replacing the fuel tank cap is one of the simpler service tasks, but it has a direct impact on the functioning of the entire fuel system. It is worth remembering to regularly check the condition of the seal and the correct closing of the filler flap. For drivers who want to better understand the relationships between the cap, tank, pump, and injectors, a guide describing the construction and maintenance of the fuel system will be helpful – detailed information can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

Expanding work in the fuel filler zone

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

For those considering a wider use of parts from disassembly, including components related to the fuel system, practical tips on choosing and verifying such components may be useful – more information can be found in the guide Buying used car parts – the most common mistakes when choosing tuning parts.