Mercedes ML W164 OM642 Fuel Filter High Pressure Pump Line Pipe Hose A6420700281

Description

Mercedes ML W164 OM642 Fuel Filter High Pressure Pump Line Pipe Hose is an original diesel fuel system component designed for the OM642 diesel engine in the ML W164 model. As part of the Lines, hoses and pipes group, it ensures stable fuel delivery and supports the proper operation of the power unit. This used OEM component is a sensible choice for fuel system maintenance when you require factory fitment and predictable performance parameters.

Specifications and technical data

• SKU: A6420700281
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420700281
• Substitutable numbers: A6420700281, A 642 070 02 81
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and role in the fuel system

The fuel line in the OM642 diesel engine is responsible for the safe and leak-free delivery of diesel fuel between fuel system components. In diesel units, where operating pressures are high, the proper design of the line is crucial for:

• maintaining stable fuel pressure across the entire load range,
• reducing the risk of leaks and air entering the system,
• maintaining the correct operating characteristics of the OM642 engine,
• ensuring compliance with factory injection specifications.

Choosing a fuel line dedicated to the ML W164 helps avoid problems typical of aftermarket replacements with imprecise shapes or different materials.

Benefits of using an original Mercedes fuel line

By using a fuel line sourced from a dismantled Mercedes vehicle, you preserve the factory geometry of the fuel line routing and compatibility with mounts and accessories in the engine bay. This translates into:

• secure fitment with brackets and adjacent components in the ML W164,
• proper line routing while maintaining required bending radii,
• reduced risk of chafing and vibration during operation,
• maintenance of the original design concept of the OM642 diesel fuel system.

The used OEM element is particularly attractive for repairs where compliance with service documentation and factory parameters is important, while simultaneously allowing you to optimize maintenance costs.

Application in the OM642 diesel engine

The OM642 engine is an advanced diesel unit in which the fuel system operates under significant load. The dedicated fuel line supports:

• stable supply across the entire RPM range,
• proper cooperation with the diesel injection system,
• maintaining tightness at varying operating temperatures,
• limiting pressure drops along the line section.

As a result, replacing a worn or damaged line with the correct component for the ML W164 helps restore the predictable behavior of the power unit and facilitates further diagnostics of potential faults.

Condition and installation aspects

The fuel line offered in this listing is in used condition, meaning it comes from a previously operated vehicle but is still suitable for further use after standard workshop verification. During installation, it is recommended to:

• inspect sockets and quick-connectors for mechanical damage,
• check sealing surfaces before installation,
• apply appropriate tightening torques in accordance with service documentation,
• inspect other diesel fuel system components for potential leaks.

This approach allows you to fully utilize the potential of the used line and reduce the risk of needing to re-intervene in the fuel system.

System expansion and related parts

If you are planning a comprehensive repair or upgrade of the fuel system area in your Mercedes and need other elements from the same group, such as additional lines, flexible hoses, or rigid supply pipes, check the available parts in the Mercedes Lines, hoses and pipes category.

To better plan the scope of work on your car and combine technical service with improved user comfort, it is also worth checking out our guide on interior upgrades – you will find practical tips in the article Interior metamorphosis: how branded seats from dismantling improve comfort and car value.