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 vehicles with diesel engines. It ensures a tight seal of the filler neck, stabilizes the operating conditions of the diesel fuel system, and helps maintain the appropriate level of operational safety.

Specifications and technical data

• SKU: A2114700805-1
• 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 C-Class and CLK models is responsible for a controlled, tight closure of the tank neck, which limits diesel evaporation and minimizes the risk of contaminants entering the system. For Diesel units, this is significant for maintaining tank pressure stability and the proper operation of pumps and injectors.

This element is designed as part of the fuel system, working in conjunction with the tank ventilation and anti-leakage protections. A properly selected cap helps maintain the correct operating parameters of the entire fuel supply system, which translates into smooth engine operation and predictable fuel consumption.

Compatibility with the Diesel system

The presented cap is intended for diesel-powered Mercedes vehicles, meaning it is adapted to the characteristics of Diesel fuel in terms of tightness, material resistance, and compatibility with the ventilation system. This ensures proper protection against moisture and dirt entering the filler neck and further system components.

Proper fitment of the cap to the specific engine and body version is crucial to avoid installation problems and leaks. If you have any doubts regarding selection by OEM number or VIN, it is worth using the guide: how to choose the right car part by VIN and OEM number, which describes the compatibility verification process step by step.

Condition of the item and benefits of using a used part

The offered fuel filler cap is a used item, which allows for an economical repair while maintaining factory geometry and fitment to the filler socket. In practice, this means the possibility of quickly replacing a damaged or worn cap without the need for modifying the tank neck or using additional adapters.

Using an original component from the secondary market reduces the risk of problems with closing, looseness, or improper seal operation, which may occur with lower-precision replacements. This is a particularly beneficial solution for intensive operation, typical for cars with a Diesel engine.

Impact on the fuel system and operation

A functional fuel filler cap has a direct impact on the durability of fuel system components, especially sensitive Diesel sub-assemblies such as high-pressure pumps or precision injectors. Limiting the access of contaminants and moisture to the fuel tank reduces the risk of internal corrosion, filter clogging, and starting problems in low temperatures.

If you want to better understand the relationship between tank tightness, pump and injector operation, and proper fuel management, check out the article: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. You will find practical tips on diagnostics and fault prevention there.

Expanding the service of the Mercedes fuel filler zone

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