Mercedes W164 W176 W906 Fuel Filter Retainer OM651 A6420904852

Mercedes W164 W176 W906 Fuel Filter Retainer OM651 is an original fuel system component designed for Mercedes diesel engines from the OM651 family. The robust construction of the housing ensures stable mounting of the filter cartridge as well as leak-proof fuel routing, which translates into safe operation of the fuel system and proper protection of the injectors.

Specifications and technical data

• SKU: A6420904852-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420904852
• Substitutable numbers: A6420904852, A 642 090 48 52
• Part type: Fuel Filter
• Category: Fuel Filters

Purpose and function in the fuel system

The fuel filter housing in the OM651 engine is responsible for maintaining the correct pressure and direction of fuel flow through the filter cartridge, as well as ensuring a tight connection with fuel lines and sensors. In Mercedes W164, W176, and W906 models, this component works with a precise common rail injection system, which is why its condition has a direct impact on the engine's performance and the durability of the injectors.

Using an original housing from the Fuel filters group allows for maintaining factory connection geometry and mounting points, which facilitates installation and minimizes the risk of leaks or improper routing of lines.

Construction and technical features of the housing

The fuel filter housing in this version is designed specifically for the OM651 engine, taking into account requirements regarding pressure resistance, temperature, and contact with diesel fuel. The body ensures stable seating of the filter cartridge, and the integrated connection ports allow for proper connection of supply and return lines.

Key design features include, among others:

• a dedicated socket for the fuel filter cartridge, ensuring uniform sealing,
• factory mounting points matched to W164, W176, and W906 bodies,
• connection layout consistent with the original fuel line system.

Thanks to this, the housing works with factory brackets and accessories, which reduces installation time and the risk of service errors.

Benefits of using an original fuel filter housing

Using an original fuel filter housing in a Mercedes with an OM651 engine allows for maintaining fuel system operating parameters in accordance with the manufacturer's specifications. A correctly selected component helps reduce the risk of air ingress, leaks, and pressure drops, which can lead to starting problems or rough engine operation.

The most important advantages include:

• factory fit for the Mercedes fuel system,
• stable mounting of the filter cartridge,
• maintenance of fuel connection tightness when installed correctly,
• compatibility with accessories used in W164, W176, and W906 models.

For workshops and users, this means predictable installation and a lower risk of warranty returns related to leaks in the fuel filter area.

Component condition and use in service practice

The offered fuel filter housing is a secondary market part, sourced from dismantling, which allows for economical repair of the fuel system while maintaining the original manufacturer's specifications. This type of solution is particularly beneficial for older Mercedes W164, W176, and W906 vehicles, where reasonable service costs are important while maintaining compliance with the factory design.

Replacing the housing is recommended, among other things, when cracks in the body, thread damage, venting problems, or recurring leaks in the fuel filter area are detected. A correctly selected component helps restore stable operation of the fuel system and facilitates subsequent, regular replacement of the filter cartridge.

Related products and technical knowledge

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

To better understand the role of the fuel filter housing in the entire supply circuit, it is worth referring to expert material describing the diagnostics and operation of the injection system – a detailed discussion can be found in the article "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration".

If you are considering a broader repair of your Mercedes using components from dismantling, the guide on selecting original used components may also be helpful – more information can be found in the post about used Mercedes parts from dismantling.