Mercedes W167 W213 OM654 Diesel Fuel Line Return Pipe Hose A6540702200

Mercedes W167 W213 Diesel Fuel Return Line OM654 A6540702200 is an original fuel system component designed for Mercedes diesel engines from the OM654 family. Thanks to precise fitting to the factory installation, it ensures stable fuel return to the tank and proper operation of the common rail system. This is a solution for users who expect guaranteed compatibility with Mercedes construction without the need for modifications.

Specifications and technical data

• SKU: A6540702200-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6540702200
• Substitutable numbers: A6540702200, A 654 070 22 00
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and Function in the Fuel System

The offered line belongs to the group of Lines, Hoses, and Tubes and is responsible for returning excess diesel fuel from the injection rail and injectors to the tank. In a Diesel engine like the OM654, a properly functioning return line is crucial for:

• maintaining stable pressure in the common rail system,
• draining excess fuel without introducing air into the system,
• reducing the risk of leaks in the engine bay,
• ensuring proper injector operation under varying loads.

The component is structurally adapted to the architecture of the OM654 unit used in Mercedes W167 and W213 models, which facilitates installation in place of the factory line.

Compatibility with OM654 Diesel Engine

The OM654 engine is a modern Mercedes diesel unit where the fuel system operates under high pressure and requires sealed, properly shaped lines. Using a dedicated return line for this type of fuel:

• supports uniform fuel drainage at various operating temperatures,
• reduces the risk of micro-cracks and leaks typical of structurally incompatible components,
• ensures compliance with the factory routing of lines in the engine bay.

This allows the diesel fuel system to maintain stability, and the operation of the OM654 unit remains predictable and repeatable in daily use.

Component Characteristics and Application Benefits

The return line, as an original Mercedes component, has been designed with specific mounting points and routing in the engine bay in mind. In practice, this means:

• easier installation without the need to adjust length or shape,
• maintaining factory line routing, which simplifies servicing and diagnostics,
• consistency with other fuel system components in W167 and W213 models.

Using a component of this type often allows for an economical repair of the fuel system while maintaining the original manufacturer's specifications. This is particularly important in modern diesel engines, where incorrect line selection can lead to starting problems, power loss, or engine control unit errors.

Application in Service Practice

Replacement of the return line is recommended, among other things, when fuel leaks, signs of abrasion, mechanical damage are found, or after interventions in the injection system. Using an original Mercedes line:

• facilitates maintaining the seal of quick connectors and spigots,
• minimizes the risk of incorrect line routing in the engine bay,
• allows for maintaining system operating parameters in accordance with the manufacturer's design.

This is a particularly beneficial solution for workshops specializing in the Mercedes brand and for users who want to restore the fuel system to a state close to factory condition.

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 supply lines, flexible fuel hoses, or rigid return pipes, check the available parts in the Mercedes Lines, Hoses, and Tubes category.

Technical Support and Cost Optimization

When planning fuel system repairs, it is worth considering both the selection of appropriate lines and the overall service strategy for diesel engines. For a comparison of repair and operation approaches for different units, it is worth familiarizing yourself with the material comparing popular Volkswagen designs – Volkswagen 1.9 TDI vs 1.4 TSI – Evolution of VW Engines and Repair Costs. This allows for a better understanding of how used components, such as fuel lines, can support sensible service cost management while maintaining adequate reliability.