Mercedes ML W166 Diesel OM642 OM651 Adblue Neck Additive Filler Pipe A1664701720

Mercedes ML W166 Diesel OM642 OM651 Adblue Neck Additive Filler Pipe is a specialized component of the AdBlue supply system in diesel vehicles, belonging to the Fuel tanks and filler pipes category. It is responsible for the safe and leak-proof delivery of the AdBlue solution to the tank, which has a direct impact on the proper operation of the exhaust emission reduction system in diesel units. This solution is designed for users who expect stable operation and compliance with the factory system architecture.

Specifications and technical data

• SKU: A1664701720-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1664701720
• Substitutable numbers: A1664701720, A 166 470 17 20
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Application and function in the AdBlue system

The described AdBlue filler pipe is a component designed for installation in the Mercedes ML W166 generation model with an OM642 diesel engine, working with the AdBlue additive. Its task is to guide the medium from the filler neck to the tank in a way that ensures proper tightness and resistance to the urea solution used in Diesel vehicles. A correctly selected filler pipe reduces the risk of leaks, airlocks, and problems with filling the system.

By maintaining the original geometry and diameters, the pipe allows for proper flow during refueling, which translates into ease of use and stable operation of the SCR exhaust emission reduction system. This is particularly important in vehicles operated intensively, where the AdBlue system works under a wide range of loads and temperatures.

Compatibility, identification, and selection

The element belongs to the Fuel tanks and filler pipes group, which facilitates its identification in parts catalogs and online configurators. The original OEM part number and available replacement numbers allow for precise matching of the pipe to a specific vehicle configuration, minimizing the risk of ordering errors. In practice, this means that both the OEM designation and reference numbers, as well as vehicle data (model, generation, engine type), can be used for selection.

In case of doubt, it is useful to compare the shape and routing of the pipe with the factory-installed element. Maintaining compliance with the original pipe routing in the body cavity and around the AdBlue tank is important to avoid stress, rubbing against other components, and potential leaks in the long term.

Product characteristics and condition

The AdBlue filler pipe is offered as a used part, which allows for economical system repair while maintaining the original Mercedes manufacturer's specifications. A used component from the Fuel tanks and filler pipes group, sourced from dismantling, is an attractive alternative to new elements, especially for older ML W166 units, where service cost optimization is of great importance.

Choosing an original used AdBlue filler pipe allows for maintaining factory fitment to mounts, brackets, and routings in the body. As a result, installation is generally simpler, and the risk of compatibility issues is lower than with aftermarket replacements with universal geometry. This solution is aimed at workshops and individual users who expect predictable installation and proper cooperation with the existing system.

Benefits of using an original AdBlue filler pipe

• Maintaining proper AdBlue system filling and reducing the risk of leaks.
• Compliance with the factory pipe routing in the ML W166 model body.
• Possibility of economical repair through the use of a used part.
• Better fit to brackets and mounts than many aftermarket replacements.
• Support for the proper operation of the exhaust emission reduction system in a diesel engine.

Technical support, selection, and educational materials

To better understand the relationships between the tank, filler pipes, and the rest of the supply system, it is worth referring to specialized materials. A practical discussion of the construction and diagnostics of the fuel system, along with the selection of elements by OEM and VIN numbers, can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which helps organize knowledge about the operation and service of modern diesel units.

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