AdBlue Tank Cap Mercedes C118 W177 W247 Fuel Filler Cover A0004701800

AdBlue Tank Cap Mercedes C118 W177 W247 Fuel Filler Cover is an original component of the AdBlue dosing system, designed for modern Mercedes models with diesel engines. It ensures a tight seal of the tank, protecting the system against contaminants and unwanted moisture ingress. Thanks to its factory origin, it is precisely matched to the thread and geometry of the filler neck, which facilitates installation and daily operation.

Specifications and technical data

• SKU: A0004701800
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0004701800
• Substitutable numbers: A0004701800, A 000 470 18 00
• Category: Fuel Tank Caps

Purpose and technical function

The AdBlue Tank Cap Mercedes C118 W177 W247 Fuel Filler Cover is responsible for the safe and tight closure of the urea solution filler, which works in conjunction with the SCR exhaust gas treatment system. A properly selected cap limits the risk of dirt, dust, and water entering the tank, which has a direct impact on the service life of the AdBlue pump, lines, and injector.

This component is particularly important in vehicles operated in variable weather conditions and in urban traffic, where frequent AdBlue refueling increases the mechanical and thermal load on the filler neck. The appropriate geometry and material composition support the stable operation of the entire dosing system.

Compatibility with Mercedes models

The presented cap has been designed for Mercedes C118, W177, and W247 platforms, which means it fits the body structure and filler placement in these generations. Using an original solution eliminates the need for modifications and minimizes the risk of leaks resulting from the use of aftermarket parts with imprecise dimensions.

By maintaining the manufacturer's standards, the cap works with the factory thread and seal, which translates into repeatable, secure tightening and comfort of use when refilling AdBlue at a station.

Condition, quality, and functional advantages

The offered item comes from the Fuel filler flaps and caps group and is a used product, which allows for economical repair while maintaining the original specification. The preserved factory design promotes proper adhesion to the filler neck and stable pressure on the seal.

Key benefits of using this cap include:

• maintaining the tightness of the AdBlue system and limiting the risk of contaminants entering,
• maintaining compatibility with the factory filler design in C118, W177, and W247 models,
• simple installation without the need to adapt additional elements,
• consistent exterior appearance with other body components.

Technical support and component selection

The selection of the correct cap for the AdBlue system should always be based on manufacturer data and part numbers, which helps avoid compatibility issues. In case of doubt, it is helpful to compare the design with the currently installed component and verify it against the specific body model.

To better understand the relationships between the tank, filler, and other components of the fuel and dosing system, it is worth consulting specialized technical materials. Practical information on diagnostics, selection by part numbers, and operation can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which organizes key issues related to the maintenance of modern fuel systems.

Expansion of Mercedes filler modernization

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

For users interested in a broader approach to maintaining vehicles with the star, including C-Class and E-Class models, a service guide describing the operation and selection of engine accessories may also be helpful. Practical tips on maintaining high reliability can be found in the material Reliability under the star sign – how to take care of engine accessories in popular Mercedes-Benz C-Class and E-Class models?, which facilitates the planning of further service work.