Mercedes W213 W222 OM656 Diesel Fuel Overflow Hose Fuel Return Line A6560704200

The Mercedes W213 W222 OM656 Fuel Return Hose is an original fuel system component designed for OM656 diesel engines in luxury Mercedes E-Class (W213) and S-Class (W222) models. With precise fitment to the factory installation, it ensures stable fuel return and supports the proper functioning of the entire injection system. This is a solution for users who expect consistency with factory specifications and predictable engine performance.

Specifications and technical data

• SKU: A6560704200
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6560704200
• Substitutable numbers: A6560704200, A 656 070 42 00
• Fuel type: Diesel
• Category: Other Air & Fuel Delivery

Purpose and Function in the Fuel System

The fuel return hose in the OM656 diesel engine is responsible for the controlled return of excess fuel from the injectors to the fuel system. The proper operation of this component:

• stabilizes fuel rail pressure,
• reduces the risk of air entering the system,
• supports uniform injector operation under various engine loads,
• indirectly affects engine smoothness and exhaust emissions.

In diesel engines, precise fuel flow management is crucial for the durability of components and maintaining factory performance parameters, which is why using a hose consistent with the OM656 design is particularly important.

Compatibility with Mercedes W213 and W222

The offered return hose has been designed for OM656 units installed in the W213 (E-Class) and W222 (S-Class) body styles. This means:

• geometry adapted to the engine bay space of these models,
• retention of original mounting points and hose routing,
• consistency with the factory diesel fuel system.

This ensures a tidy installation without the need for system modifications, and the fuel system retains the configuration intended by the manufacturer.

Characteristics of a Used Part

The fuel return hose is offered as a used part, allowing for an economical repair of the fuel system while maintaining a component that is consistent with the original Mercedes specification. For many users, this is a sensible compromise between cost and preserving the factory design of the fuel system. Before installation, a standard check of tightness and connector condition is recommended, in accordance with service procedures for diesel engines.

Benefits of Using an Original Return Hose

Using a fuel return hose dedicated to the OM656 in W213 and W222 offers a number of practical benefits:

• maintaining proper fuel circulation in the diesel engine,
• reducing the risk of leaks resulting from ill-fitting aftermarket parts,
• preserving the factory routing of hoses in the engine bay,
• supporting uniform injector operation and engine stability.

For users who want to restore full fuel system functionality after service intervention or injector replacement, such a component is an important addition to the entire repair procedure.

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 fuel lines, connectors, or small mounting elements, check the available parts in the Other Mercedes category.

Technical Support and Knowledge for Diesel Users

When working with modern diesel units, it is beneficial to expand your knowledge of operation and component selection. For drivers interested in comparing performance and technical solutions in powerful versions of premium models, the article Audi RS vs. Other Models – What Lies Under the Hood and Chassis? may be helpful, discussing differences in engine, brake, and chassis design. This is a good supplement to understanding how manufacturers design powertrains in high-performance vehicles.

If you want to better plan your car's service and understand which wear parts are most frequently replaced, you will find practical tips in the guide TOP 10 Most Frequently Replaced Parts in Your Car. This will allow you to approach the maintenance of the fuel system and other components consciously, thereby extending the trouble-free operation of your Mercedes diesel.