Audi A4 B8 Fuel Tank Filler Cap Screw Petrol 1J0201550AS

Audi A4 B8 Fuel Tank Filler Cap Screw Petrol for petrol engines is a practical component of the fuel system that ensures a tight seal of the filler neck and stable operating conditions for the tank. The original Audi design with a threaded mount guarantees secure tightening, and its application for petrol fuel allows for maintaining proper operating parameters. This solution is intended for users looking for a proven, factory-made component instead of universal replacements.

Specifications and technical data

• SKU: 1J0201550AS-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 1J0201550AS
• Substitutable numbers: 1J0201550AS, 1J0 201 550 AS
• Fuel type: Petrol
• Category: Fuel Flaps & Components

Purpose and function in the fuel system

The presented cap is an item from the Fuel filler caps and accessories group, designed specifically for use with the petrol supply system in the Audi A4 B8. Its task is to maintain the tightness of the filler neck, limit fuel evaporation, and protect against the ingress of external contaminants.

Being dedicated to petrol fuel means that the materials used and the sealing geometry are adapted to the characteristics of this fuel, which helps maintain stable pressure in the tank and improves the operating conditions of the entire fuel system.

Construction and functional features

The fuel filler cap with a threaded mount ensures secure, repeatable tightening and easy handling during refueling. This solution minimizes the risk of accidental loosening and makes it easier for the driver to quickly unscrew and tighten it during daily use.

Key advantages of this solution include:

• Stable sealing of the filler neck, supporting the proper operation of the fuel tank.
• Dedicated to petrol-powered systems, which helps maintain correct operating parameters.
• Based on the original Audi design, which translates into a perfect fit for the filler geometry in the A4 B8.

Original origin and fitment

As an Audi brand component, the cap has been designed with compliance to the manufacturer's factory standards in mind. Thanks to this, it fits the intended filler socket without the need for modifications, and its geometry and mounting method are consistent with the original design of the bodywork and fuel system.

This approach reduces the risk of leaks, improper fit, or interference with the filler flap, which can occur when using universal solutions. Choosing an original Audi component is particularly important in vehicles where maintaining factory functionality and structural consistency is a priority.

Condition and service application

The item comes from the used parts group, which makes it an attractive cost-effective alternative compared to new components, while maintaining the manufacturer's original design. It can be used both for standard replacement of a worn cap and for service work related to the fuel system, where restoring proper filler tightness is required.

In practice, installation is limited to basic service procedures, and using a component from the same model platform makes it easier to maintain compliance with the vehicle's factory parameters.

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, accessory covers, or mounting elements, check the available parts in the Audi fuel filler caps and accessories category.

Technical support and part selection

When selecting fuel system components – including filler caps – it is worth paying attention to compatibility with the fuel type, model platform, and manufacturer markings. Comparing the design with the currently installed part and verifying the catalog numbers in the service documentation can be helpful.

To better understand the role of the filler cap in the entire fuel supply system, as well as the principles of diagnostics and operation of fuel components, it is worth checking out our guide: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.