Mercedes W163 W203 OM611 OM612 Diesel Fuel Cooler Housing Cover A6120700211

Mercedes W163 W203 OM611 OM612 Diesel Fuel Cooler Housing Cover is a specialized fuel system component designed for Mercedes diesel engines, responsible for the stable mounting and routing of the fuel cooler. Thanks to its factory geometry and compatibility with OM611 and OM612 units, it ensures proper diesel fuel cooling and supports the trouble-free operation of the entire fuel supply system. This solution is dedicated to users looking for parts with original OEM construction for M-Class W163 and C-Class W203 models.

Specifications and technical data

• SKU: A6110700179-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6110700179
• Substitutable numbers: A6110700179, A 611 070 01 79, A6120700211, A 612 070 02 11
• Fuel type: Diesel
• Category: Fuel Filters

Purpose and function in the fuel system

The fuel cooler housing in Mercedes diesel engines is responsible for the stable seating of the heat exchanger and the proper routing of fuel lines. In OM611 and OM612 units, used in models such as the W163 and W203, this component:

• ensures proper positioning of the cooler relative to the engine block and accessories,
• maintains a constant flow of fuel through the exchanger, which reduces the risk of diesel fuel overheating,
• supports smooth injector operation by stabilizing fuel temperature,
• minimizes mechanical stress on connectors and lines.

As a result, the entire Diesel engine fuel supply system operates under more predictable thermal conditions, which promotes engine performance and correct injection characteristics.

Benefits of using an original fuel cooler housing

Using a fuel cooler housing dedicated to specific Mercedes engines and bodies translates into a number of practical service and operational benefits:

• Factory fit – preserved geometry of mounts and connectors facilitates installation in the engine bay without the need for modifications.
• Stable fuel system operation – a properly mounted cooler reduces vibrations and line stress.
• Support for injector and pump durability – more stable fuel temperature promotes uniform operation of precision components.
• Can be used in repair and regeneration processes of the fuel supply system in diesel engines.

Application in Diesel engines

The presented housing is intended for Diesel fuel supply systems, where fuel temperature has a direct impact on injection parameters and exhaust emissions. In such units, the fuel cooler, together with a properly selected housing:

• helps keep fuel within the optimal operating temperature range,
• reduces the risk of cavitation and pressure drops in the system,
• supports operational stability under heavy loads and long-distance highway driving.

For users operating their vehicle in varied road and temperature conditions, this is an essential element affecting engine performance predictability.

Product characteristics and condition

The fuel cooler housing belongs to the group of fuel system components that are often replaced during major engine service work or during accessory regeneration. The product comes from disassembly, which allows for maintaining the original construction and fit to factory mounting points in Mercedes vehicles.

For mechanics and users servicing the vehicle themselves, this means the ability to use a part with known geometry, compatible with existing accessories, lines, and the fuel cooler, without the need to adapt universal solutions.

Technical support and component selection

The selection of the correct fuel cooler housing for a specific vehicle should always be based on fuel system data and service documentation. It is helpful to use manufacturer markings, reference numbers, and information about the engine and body type used. In case of doubt, online catalogs and visual comparison with the removed part may be useful.

To better understand the role of this type of component in the entire fuel supply system, it is worth checking out the guide material describing diagnostics, regeneration, and operation of fuel supply components – this is discussed in detail in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, where you will find practical tips on working with diesel engines.

Related items from the Mercedes Fuel Filters group

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as fuel filter cartridges, filter housings, or additional mounting elements, check the available parts in the Mercedes Fuel Filters category.