Mercedes W164 OM629 Fuel Distributor Injection Pipe Line Left N/S A6290700000

Mercedes X164 OM629 Fuel High-Pressure Injector Line Left is a precise component of the diesel engine fuel supply system, designed for operation under demanding pressure conditions. It is responsible for the stable delivery of diesel fuel to the injector on the left side of the engine unit, which directly impacts the engine's running smoothness and efficiency. By maintaining factory geometry and flow diameters, the line ensures correct supply parameters in Diesel engines.

Specifications and technical data

• SKU: A6290700000
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6290700000
• Substitutable numbers: A6290700000, A 629 070 00 00
• Location on the vehicle: Left
• Fuel type: Diesel
• Category: Fuel Pumps & Sending Units

Purpose and Function in the Fuel System

The left-side high-pressure fuel injector line in Mercedes models with the OM629 engine operates between the high-pressure pump and the injector, transferring fuel under very high pressure. Its task is to maintain system tightness, minimize pressure losses, and ensure repeatable, stable supply for each injection cycle. In a diesel engine, a proper high-pressure line is crucial for performance, exhaust emissions, and operational safety.

Compatibility and Technical Specifications

This component has been specifically designed for Diesel engines, guaranteeing adaptation to the characteristics of a diesel engine's operation – both in terms of working pressure and resistance to vibrations and temperature changes. Its placement on the left side of the engine means the line's geometry is matched to the factory routing within the engine bay, maintaining appropriate bending radii and mounting points.

To ensure full compatibility with a specific vehicle, it is recommended to verify by OEM part number or interchangeable numbers and match it to the engine code. This approach minimizes the risk of installation problems and guarantees that the line will work with the existing injection system without modifications.

Performance Characteristics and Benefits of Use

As a component of the fuel supply system, the left-side high-pressure fuel injector line affects:

• pressure stability in the fuel rail and at the injector,
• correct fuel metering by the injector,
• reduction of leakage and spill risks in the high-pressure zone,
• maintenance of proper engine operation across the full load range.

Choosing an original line designed for a specific engine configuration allows for the preservation of the engine unit's factory operating parameters. This is particularly important in modern diesels, where even minor deviations in the fuel supply system can cause control unit errors, power loss, or rough idling. A dedicated high-pressure line minimizes these risks and facilitates future diagnostics.

Condition, Installation, and Best Service Practices

The line is a used part from a dismantled vehicle, offered as a cost-effective solution while maintaining original specifications. Before installation, standard service procedures are recommended: checking sealing seats, cleanliness of connections, and correct routing of the line relative to other components in the engine bay. Proper installation, adhering to torque specifications and maintaining the cleanliness of the fuel system, directly impacts the line's durability and the engine's operational safety.

In case of extensive fuel system repairs, it is advisable to concurrently inspect other high-pressure lines, the fuel pump, and level and pressure sensors to restore the full efficiency of the entire system in one intervention.

If you are planning a comprehensive repair or upgrade of the fuel supply system in your Mercedes and need other parts from the same group, such as high-pressure lines, pump components, or fuel level sensors, check the available parts in the Mercedes Fuel Pumps and Level Sensors category.

For users who are also analyzing the engine control electronics and sensors during fuel system work, a guide on selecting and installing used modules and sensors may be helpful – you can find it in the article Used Automotive Electronics Onboard – Why Choose Second-Hand ECU Modules and Sensors?.