Mercedes W907 Diesel OM654 Fuel Line Fuel Feed Return Pipe Hose A9074701902

Mercedes W907 Diesel OM654 Fuel Line Fuel Feed Return Pipe Hose is an original fuel system component designed for diesel engines, engineered by Mercedes to ensure stable and controlled fuel flow. This component from the Lines, hoses and pipes category provides precise routing of diesel fuel in the modern OM654 unit, supporting the proper operation of the entire injection system.

Specifications and technical data

• SKU: A6540706002
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6540706002
• Substitutable numbers: A6540706002, A 654 070 60 02, A9074701902, A 907 470 19 02
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The described fuel line is a component dedicated to the OM654 diesel engine in the Mercedes W907 model, where it is responsible for the safe delivery of fuel within the supply system. A properly selected line minimizes the risk of pressure drops, leaks, and injection malfunctions, which translates into stable engine operation and predictable performance.

In modern diesel engines, such as the OM654, the quality and fit of fuel lines are crucial for maintaining the correct pressure in the common rail system, proper fuel atomization, and reducing wear on precision components.

Construction and fit for the diesel system

The line has been specifically designed to work with diesel fuel, taking into account the characteristic viscosity and operating pressure parameters for this engine unit. The design of the line is adapted to the geometry of the W907 engine bay, which facilitates the routing of the fuel line while maintaining the correct bending radius and ensuring it does not interfere with other components.

The appropriate shaping and end fittings of the line allow for a secure connection with other system elements, reducing the risk of micro-leaks that could lead to air entering the system or fuel leaks. As a result, the line supports the maintenance of stable engine operating parameters under a wide range of loads.

Benefits of using an original Mercedes line

Using an original fuel line in the OM654 diesel engine allows you to maintain the manufacturer's factory specifications regarding fuel flow and pressure. The main advantages of this solution include:

• maintaining compliance with the factory operating characteristics of the injection system,
• reducing the risk of starting problems and rough idling,
• better repeatability of combustion parameters compared to replacements of uncertain origin,
• easier diagnostics of potential fuel system faults due to the preservation of the original configuration.

The element from this group is particularly important during the servicing of diesel units, where the precision of fuel dosing has a direct impact on the durability of injectors, the high-pressure pump, and exhaust emission levels.

Condition, verification, and service application

The offered line comes from the used parts segment, which allows for an economical restoration of the fuel system's efficiency while maintaining the original manufacturer's specifications. Before installation, it is recommended to perform a standard check of connection tightness, the condition of the ends, and the correct positioning of the line in the engine bay to avoid mechanical stress and potential damage during operation.

Replacing the fuel line is particularly recommended in situations where symptoms such as the smell of fuel near the engine, traces of moisture on the lines, problems with maintaining system pressure, or abnormal engine operation under load occur. Selecting an element compatible with the design of the OM654 unit makes it easier for a mechanic to carry out repairs without the need for system modifications.

Fuel system service expansion and technical knowledge

When working on the diesel supply system, it is worth comprehensively assessing the condition of other components – the pump, injectors, filters, and other lines. It is also good practice to verify the condition of the engine unit before investing in extensive service. In this context, the following guide may be helpful: Buying a used engine: 5 things you must check before installation, which discusses key steps for assessing the condition of the drivetrain before further work.

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 flexible hose sections, rigid supply or return pipes, and fuel system connectors, check the available parts in the Mercedes lines, hoses and pipes category.