Seat Ibiza Mk4 Volkswagen Passat B7 Fuel Tank Filler Cap Screw Diesel 3AA201550M

Visual condition of the part

The product shows signs of use visible in the photos.

Seat Ibiza Mk4 Volkswagen Passat B7 Fuel Tank Filler Cap Screw Diesel is a precisely fitted component from the Fuel tanks and filler pipes category, designed for diesel fuel systems. It is responsible for sealing the filler neck, stabilizing pressure in the tank, and ensuring the safe operation of the fuel system in diesel-powered vehicles.

Specifications and technical data

• SKU: 3AA201550M
• Mark: Seat
• Condition: Used
• OEM Part Number: 3AA201550M
• Substitutable numbers: 3AA201550M, 3AA 201 550 M
• Fuel type: Diesel
• Part type: Filler Neck
• Category: Fuel Tanks & Filler Necks

Purpose and technical function

The fuel filler cap in the version dedicated to Diesel units is a working component of the fuel system, responsible for maintaining the tightness of the filler neck and limiting fuel evaporation. A properly selected cap minimizes the risk of contaminants entering the tank, which has a direct impact on the service life of the injectors, high-pressure pump, and other fuel system components.

The offered model is structurally linked to the platform used in, among others, the Seat Ibiza Mk4 and Volkswagen Passat B7, which allows it to be used as a replacement for the factory component in vehicles with diesel engines, while maintaining the correct operating parameters of the system.

Construction and performance parameters

The cap has been designed as a working element that cooperates with the fuel filler neck in VAG group vehicles. The design provides appropriate sealing and proper routing of air and fuel vapors in accordance with the vehicle manufacturer's specifications. As a result, the fuel system maintains stable operating conditions, and the fuel tank is not exposed to uncontrolled pressure changes.

The solution intended for Diesel fuel takes into account the specifics of diesel oil – its density, chemical properties, and the way it is used in diesel engines. The cap works with the tank ventilation system, which is especially important in modern units with advanced exhaust gas treatment systems.

Condition, fitment, and service application

The item is offered in used condition, which allows for an economical replacement of a damaged or missing cap while maintaining functionality consistent with the factory solution. This is a practical solution for post-accident repairs, fuel system maintenance, or replacing missing parts after previous vehicle interventions.

The selection of the cap for a specific car should always be confirmed based on vehicle data or the part number to ensure proper fitment with the filler neck and compatibility with the fuel system. A properly selected cap reduces the risk of leaks, lack of tightness, and tank ventilation problems, which translates into stable operation of the diesel engine.

Benefits of installation in a Diesel fuel system

Using a dedicated fuel filler cap in diesel cars brings a number of practical benefits:

• maintaining the tightness of the fuel filler system and limiting the ingress of contaminants,
• stable operating conditions for the fuel tank and ventilation system,
• support for the proper operation of components such as the pump and injectors,
• reducing the risk of air entering the fuel supply system,
• maintaining functionality similar to the factory solution in VAG group vehicles.

For users operating a car mainly in urban cycles or on long routes, a functional fuel filler cap is an important element of fuel system maintenance, affecting trouble-free refueling and daily operation.

Related fuel system components and technical knowledge

When working on a diesel fuel system – such as replacing the cap, checking the filler neck, or servicing the tank – it is worth knowing the principles of diagnostics and component selection. A detailed discussion of the construction and operation of the fuel system, along with practical tips regarding injectors, pumps, and the tank, can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which helps to better plan repairs and preventive maintenance.

If you are planning a comprehensive repair or upgrade of the fuel system area in your Seat and need other elements from the same group, such as filler necks, supply hoses, or tank mounting elements, check the available parts in the Seat fuel tanks and filler pipes category.