Mercedes W213 C238 OM654 Pressure Pump Fuel Return Pipe Hose A6540702200

Mercedes W213 C238 OM654 Fuel Return Line is an original fuel system component designed for diesel engines of the OM654 series in the E-Class W213 and C238 models. Thanks to its factory geometry and correct diameter, it ensures stable fuel return to the system, promoting even injector operation and proper pressure regulation. A used OEM component is a sensible choice for fuel system servicing when you prioritize a fit that matches the manufacturer's specifications.

Specifications and technical data

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

Purpose and Function in the Fuel System

The fuel return line in the OM654 engine is responsible for draining excess fuel from the fuel rail and injectors back to the tank. A correctly selected component:

• stabilizes pressure in the common rail system,
• reduces the risk of air entering the lines,
• supports even injector operation under various loads,
• helps maintain proper starting parameters for both warm and cold engines.

For OM654 units, the precision of the return line's manufacturing directly impacts engine running smoothness and the proper functioning of the injection system.

Construction and Fit for Mercedes W213 / C238 OM654

The offered line belongs to the Hoses, Pipes, and Tubes category, meaning it has been specifically designed to operate in the fuel environment under the hood of a Mercedes. The line's construction includes:

• appropriately selected flexibility, facilitating routing in the engine bay,
• a shape that matches factory mounting points,
• the use of materials resistant to diesel fuel and the typical operating temperatures of the OM654 unit.

This ensures a tidy installation without the need for modifications or makeshift solutions, and the line maintains its correct position relative to other auxiliary components.

Benefits of Using an Original Return Line

Using an original fuel return line in a Mercedes E-Class W213 or C238 with an OM654 engine helps maintain the integrity of the entire fuel system. Key benefits include:

• Factory Fitment – compliance with the geometry and diameters specified by the vehicle manufacturer.
• Reduced risk of leaks – proper connectors and line sections minimize the likelihood of fuel spills.
• Stable common rail system operation – correct fuel return promotes the maintenance of set pressure parameters.
• Seamless integration with existing auxiliaries – the line works with factory brackets and mounts in the engine bay.

By choosing a used OEM part, you gain a component that aligns with factory solutions, which is particularly important in modern diesel engines with high injection pressures.

Practical Application in Servicing

The fuel return line in the OM654 engine is worth replacing, among other things, during work related to injectors, the common rail, or when diagnosing starting problems and uneven engine operation. In service practice, this operation is often combined with:

• checking the tightness of the entire fuel system,
• verifying the condition of other flexible hoses,
• inspecting the mounts and brackets holding the lines.

This approach helps reduce vehicle downtime and streamlines fuel system maintenance into a single stage.

Related Items in the Hoses, Pipes, and Tubes Category

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other items from the same group, such as fuel lines, vacuum hoses, or cooling system pipes, check the available parts in the Mercedes Hoses, Pipes, and Tubes category.

For users interested in optimizing service costs and making informed choices when selecting used parts for other brands, an article describing practical ways to save on original components may be helpful – you can find it here: Repairing a Volkswagen on a Budget – How to Save on Original Car Parts.