Fuel Filler Cap Mercedes W203 W204 W209 Fuel Tank Cover Diesel A2114700805

Visual condition of the part 

The product shows signs of use visible in the photos. 

Fuel Filler Cap Mercedes W203 W204 W209 Fuel Tank Cover Diesel is an original component from the Fuel filler flaps and caps group, designed for diesel fuel systems. This used component ensures proper sealing of the tank neck, limits fuel evaporation, and helps maintain stable operating conditions for the fuel system in Mercedes vehicles.

Specifications and technical data

• SKU: A2114700805-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2114700805
• Substitutable numbers: A2114700805, A 211 470 08 05
• Fuel type: Diesel
• Category: Fuel Tank Caps

Purpose and technical function

The fuel filler cap in Mercedes vehicles is responsible for tightly closing the filler neck, which is important for both safety and the proper operation of the fuel system. In the version dedicated to Diesel engines, the design is adapted to the parameters of diesel fuel and the characteristics of the tank used in the W203, W204, and W209 models.

A properly selected cap minimizes the risk of contaminants entering the tank, limits the escape of fuel vapors, and helps maintain correct pressure in the system. This is particularly important in modern diesel units, where stable supply conditions affect engine performance and the durability of the equipment.

Construction and fitment for Mercedes W203, W204, W209

The presented cap is a component designed for the specific filler neck used in selected Mercedes C-Class and CLK models. This ensures a proper fit with the tank neck, correct operation of the locking mechanism, and an ergonomic grip when unscrewing and tightening.

By maintaining factory geometry and manufacturing standards, the cap works with the original fuel filler flap, requires no modifications or adaptations, and allows for maintaining the structural integrity of the entire filler assembly. This solution is particularly beneficial for repairs where maintaining compliance with the manufacturer's factory specifications is a priority.

Benefits of using an original fuel filler cap

Using a dedicated fuel filler cap in a Mercedes vehicle provides a number of practical benefits:

• maintaining filler tightness and limiting the ingress of moisture and dirt into the tank,
• maintaining proper operating conditions for the fuel system in a diesel engine,
• compatibility with the factory flap and filler neck, without the need for modifications,
• consistency with the manufacturer's safety and operational guidelines.

For the user, this means stable, predictable fuel filler operation and a lower risk of problems resulting from leaks or mismatches of aftermarket replacements of uncertain origin.

Fuel filler area and component selection

In vehicles with a diesel engine, the fuel filler area is particularly exposed to external factors, which is why the selection of the appropriate cap is important not only for utility but also for maintenance. The correct element from the Fuel filler flaps and caps group helps reduce the risk of water, dust, or small contaminants entering, which could affect the condition of the fuel system in the long term.

When replacing, it is worth paying attention to compatibility with the specific body generation and fuel type. In the case of this product, the intended use for Diesel units allows for maintaining compliance with the operational parameters provided by the manufacturer for the fuel system in a given model.

Technical support and additional materials

If you want to better understand how the fuel filler cap fits into the operation of the entire fuel system, it is worth checking out a guide describing the diagnostics and operation of components such as injectors, pumps, or the fuel tank – this is discussed in detail in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

If you are planning a comprehensive repair or modernization of the fuel filler area in your Mercedes and need other components from the same group, such as additional caps, flaps, or mounting hardware, check the available parts in the Mercedes fuel filler flaps and caps category.