Mercedes C209 W211 W414 C219 Fuel Tank Union Nut A0019908054

Mercedes C209 W211 W414 C219 Fuel Tank Union Nut is an original component from the Fuel tanks and filler pipes group, designed for Mercedes C209, W211, W414, and C219 series models. It is a practical solution for users who want to restore the full tightness of the refueling system and maintain factory-fitment of the components.

Specifications and technical data

• SKU: A0019908054
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0019908054
• Substitutable numbers: A0019908054, A 001 990 80 54
• Part type: Fuel Tank
• Category: Fuel Tanks & Filler Necks

Purpose and function of the fuel tank union nut

The fuel tank union nut is responsible for securely attaching the filler pipe to the tank and maintaining a tight seal at the connection point. In Mercedes C209, W211, W414, and C219 series vehicles, this component operates in direct contact with fuel and vapors, which is why its proper condition is essential for operational safety and the correct functioning of the fuel supply system.

Using an original nut from the same design group as the factory component helps reduce the risk of leaks, looseness at the connection, and improper alignment of the fuel filler pipe relative to the tank.

Benefits of using an original Mercedes component

Choosing a fuel tank union nut from the Mercedes range ensures:

• factory-fitment to the geometry of the tank and filler pipe in C209, W211, W414, and C219 models,
• preservation of the original connection sealing concept,
• compatibility with other refueling system components in the given vehicle generation.

As a result, installation is predictable, without the need for modifications or the use of additional adapters, and the entire system remains consistent with the factory design.

Performance characteristics and installation

The fuel tank union nut from this series is designed to operate in a fuel environment, taking into account the mechanical loads resulting from the installation of the filler pipe and temperature changes. The design provided by the manufacturer allows for:

• secure tightening of the connection without excessive stress on the thread,
• maintaining a stable position of the filler pipe relative to the tank,
• reducing the risk of contaminants entering the area around the connection.

The item is a salvaged part, which allows for economical repair while maintaining the original specifications. Before installation, a standard visual inspection of the tank socket and the filler pipe is recommended to ensure proper alignment and pressure.

Application in the Fuel tanks and filler pipes system

In the mentioned Mercedes vehicle series, the nut works with a set of components responsible for refueling and fuel storage. A correctly selected component helps maintain:

• mechanical stability of the connection between the tank and the filler pipe,
• integrity of the venting and vapor discharge system,
• trouble-free maintenance in the future.

Using original solutions within the Fuel tanks and filler pipes category is particularly important in vehicles equipped with extensive emission control systems, where leaks can result in diagnostic errors and reduced comfort of use.

Technical support and additional materials

If you are planning a comprehensive repair or upgrade of the fuel supply area in your Mercedes and need other components from the same group, such as filler pipes, connectors, or mounting elements, check the available parts in the Mercedes Fuel tanks and filler pipes category.

When working on the fuel system, it is also worth paying attention to the condition of components responsible for fuel metering. Practical tips on the safe selection of used components can be found in the article Fuel metering problems: what to look for when buying a used injection pump and fuel rails?.