Mercedes W164 X164 W211 W221 Fuel Line Leak Oil Pipe OM629 V8 Diesel A6290700832

Mercedes W164 X164 W211 W221 Fuel Line Leak Oil Pipe OM629 V8 Diesel is an original fuel system component designed for V8 diesel engines in selected Mercedes models. Thanks to its factory geometry and precise fit for the OM629 unit, the pipe ensures stable fuel delivery and maintains the operating parameters of the injection system. This is a solution for users who want to keep their fuel system configured according to the manufacturer's original specifications.

Specifications and technical data

• SKU: A6290700832
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6290700832
• Substitutable numbers: A6290700832, A 629 070 08 32
• Fuel type: Diesel
• Part type: Line
• Category: Hoses, Lines & Pipes

Purpose and role in the fuel system

The fuel pipe in the OM629 V8 Diesel engine is responsible for the safe and leak-free delivery of diesel fuel between the components of the supply system. In high-torque V8 units, fuel pressure stability is crucial for smooth operation, dynamics, and the proper functioning of the injectors. Using an original pipe allows for maintaining the correct routing, minimizing the risk of abrasion, vibrations, and unwanted stress. This component is particularly important in vehicles operated under load – in SUVs and luxury sedans, where the engine works across a wide range of loads and temperatures. A properly selected fuel pipe reduces the risk of leaks, pressure drops, and problems with starting or uneven engine operation.

Construction, fitment, and compatibility

The pipe belongs to the Lines, hoses, and tubes group, meaning it has been designed as part of the flow system, resistant to contact with diesel fuel and typical operating conditions in the engine bay. The factory shaping and mounting points are adapted to the architecture of the OM629 engine and the engine bay in Mercedes SUVs and sedans, which facilitates installation and helps avoid incorrect positioning. The original Mercedes origin translates into compliance with factory quality standards, including resistance to temperature, vibration, and operating pressure typical for modern diesel units. As a result, the pipe can be used as a replacement for a damaged component without the need for fuel system modifications.

Benefits of using an original fuel pipe

Using a fuel pipe dedicated to a V8 diesel engine brings a number of practical operational benefits:

• maintaining proper fuel flow across the entire engine load range,
• reducing the risk of leaks and pressure drops in the supply system,
• preserving the correct geometry of the pipe routing in the engine bay,
• compatibility with the injection system parameters in Diesel units,
• easier diagnostics and service thanks to the use of a component consistent with factory documentation. For users who prioritize predictable vehicle behavior and stable engine performance, choosing an original fuel pipe is a technically safe and service-friendly solution.

Condition, service application, and installation

The offered fuel pipe is a component removed from a vehicle, which allows it to be used in repairs where compliance with factory specifications is important while maintaining reasonable service costs. This type of part is suitable both for replacing a damaged pipe and for comprehensive maintenance of the fuel system in a V8 diesel engine. During installation, it is recommended to maintain the original pipe routing and check the mounting points and seals. A correctly installed component helps restore the proper operating parameters of the supply system, which has a direct impact on engine smoothness, fuel consumption, and the durability of other components. 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 flexible supply sections, rigid return tubes, or additional vent lines, check the available parts in the Mercedes Lines, hoses, and tubes category.

Additional technical and operational information

V8 diesel engines used in Mercedes models require regular inspection of the fuel system, especially in the area of pipes, connectors, and seals. Replacing the fuel pipe with a component consistent with factory specifications helps reduce the risk of air entering the system, hot-start problems, and power drops resulting from unstable fuel pressure. For drivers interested in the broader technical context of how these vehicles' powertrains work, including the cooperation of diesel units with advanced drivetrain systems, the article describing various AWD solutions may be helpful – xDrive, 4Matic, quattro or 4Motion – a comparison of AWD systems from BMW, Mercedes, Audi, and VW. It allows for a better understanding of how important the efficiency of the fuel supply system is in the context of the entire powertrain.