Mercedes W907 Diesel OM654 Fuel Line Fuel Feed Return Pipe Hose A9074701802

The Mercedes W907 Diesel OM654 Fuel Return Line is an original fuel system component designed for Mercedes diesel engines of the OM654 family in the W907 body. Thanks to its factory geometry and fit, the line ensures stable fuel return to the system, supporting the proper operation of the engine and reducing the risk of leaks.

Specifications and technical data

• SKU: A9074701802
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A9074701802
• Substitutable numbers: A9074701802, A 907 470 18 02
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and Technical Function

This line belongs to the group of Lines, Hoses, and Tubes and is a component of the fuel system in Diesel engines. It is responsible for the controlled return of excess fuel from the fuel rail or injectors to the tank, which stabilizes system pressure and supports precise fuel delivery by the engine control unit.

A properly selected fuel return line in a diesel engine reduces pressure drops, minimizes the risk of air ingress, and helps maintain smooth operation of all cylinders, which translates to improved engine refinement and predictable throttle response.

Compatibility with OM654 Diesel Engine

The component is designed for OM654 engines in the W907 body, meaning its shape, connection diameters, and routing are adapted to the factory engine bay architecture. This allows for installation at the manufacturer-designated mounting points, without the need for modifications or additional adapters.

The fuel system in modern diesel engines operates under high pressure, so using a line with appropriate design and materials is crucial for maintaining seal integrity and operational safety. The original fuel return line for the Mercedes W907 with the OM654 diesel engine was developed with this in mind.

Performance Characteristics and Installation

As an original Mercedes part, the fuel return line is optimized for a perfect fit with existing connectors and brackets in the vehicle. This simplifies servicing and reduces replacement time, as the mechanic can route the line along the factory path without the risk of rubbing against other components or excessive tension.

The line is designed for use with Diesel fuel, meaning its construction accounts for the chemical properties of diesel fuel and typical thermal conditions in the engine bay. A correctly installed component supports safe and repeatable fuel system operation, which is important for the longevity of both the injectors and the entire engine.

Condition and Benefits of Using an Original Part

This product is from the Mercedes range and is a used part, allowing for economical repair while maintaining factory specifications. Unlike aftermarket alternatives with universal geometry, the original fuel return line ensures compliance with the vehicle manufacturer's design, reducing the risk of operational issues after installation.

Using an original line in the diesel engine's fuel system helps maintain engine operating parameters close to factory levels, thereby supporting fuel pressure stability, proper starting, and predictable fuel consumption.

Fuel System Expansion and Technical Knowledge

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

If you are also interested in improving driving comfort and want to better understand how choosing branded components affects the car's feel, read the article Interior Metamorphosis: How Used Branded Seats Enhance Comfort and Car Value, which demonstrates a practical approach to vehicle modernization using salvaged parts.