Fuel Cover BMW F30 F80 M3 Fill In Flap Cap Moonwalk Grey Metallic B71

The BMW F30/F80 M3 Fuel Filler Flap in Moonwalk Grey Metallic B71 is an original body part designed for the rear of the vehicle. As part of the Fuel Filler Flaps and Accessories group, it ensures a consistent body appearance and proper protection of the fuel filler neck from dirt and moisture. A used OEM component is a sensible choice for accident repairs, paint correction, or restoring the factory look of a BMW F-series vehicle.

Specifications and technical data

• SKU: 2239979-MGM
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 2239979
• Substitutable numbers: 41002239979, 2239979, EM
• Location on the vehicle: Rear
• Color: Moonwalk Grey Metallic - B71
• Category: Fuel Flaps & Components

Purpose and Technical Function

The presented fuel filler flap is dedicated to the rear body section of BMW F-series vehicles, including M3 versions. The part is responsible for covering the fuel filler neck, maintaining the seal of the refueling area, and aesthetically completing the side body line. Thanks to its factory geometry and proper profile, the flap works with the hinge, opening mechanism, and filler neck seal, which reduces the risk of dirt and moisture entering the fuel cap area.

Color and Paint Matching

The Moonwalk Grey Metallic – B71 color is a distinctive metallic grey shade used in the BMW range, allowing for a uniform paint tone across the entire body. Choosing a flap with the same paint code significantly facilitates:

• restoring visual consistency after mechanical or parking damage,
• limiting the scope of additional painting work,
• maintaining the factory finish character in the rear fender area.

Thanks to the original metallic finish, the flap's surface harmoniously blends with the vehicle's side line, without the shade difference effect typical of aftermarket replacements.

Mounting Characteristics

The fuel filler flap from this series is designed as an OEM part, meaning it retains factory mounting points and proper geometry relative to the body. This facilitates installation in place of a damaged part without the need for bodywork modifications or edge adjustments. A correctly selected flap:

• ensures even gaps between the flap and the fender panel,
• works correctly with the opening and closing mechanism,
• maintains proper adhesion to the seal around the fuel filler neck.

A used OEM part is a practical solution for repairs where maintaining original geometry and fit with the rest of the body is crucial.

Application in the Fuel System and Body

The fuel filler flap, although a body part, directly influences the operating conditions of the fuel system – it protects the cap and filler area from water, road salt, and minor contaminants. For users who want to better understand the relationships between the refueling area and the rest of the system, the guide: Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair will be useful. The article discusses diagnostics, component selection by part numbers, and operating principles, which helps in consciously planning repairs within the entire fuel line.

Why Choose a Used OEM Flap

For body parts like a fuel filler flap, an original used part often provides a better fit than many aftermarket replacements. This solution is particularly beneficial for repairs where the following are important:

• maintaining factory gaps and body lines,
• color consistency with the rest of the body,
• compatibility with existing mounting elements.

If you are considering whether refurbishment or installing a used part would be a better choice, the guide Refurbished or Used Original – Which Part to Choose for Repair? may be helpful, discussing the practical differences between these solutions in the context of real repairs.

If you are planning a comprehensive repair or upgrade of the fuel filler area in your BMW and need other parts from the same group, such as additional flaps, covers, or accessory protective elements, check the available parts in the BMW Fuel Filler Flaps and Accessories category.