Mercedes W222 OM656 Fuel Injection Line Pressure Pipe Rail Injector A6560707000

Mercedes W222 OM656 Fuel Injection Line Pressure Pipe Rail Injector is a precision fuel system component, designed specifically for Mercedes diesel engines from the OM656 family. This line, belonging to the Lines, Hoses and Pipes group, ensures stable fuel delivery to the injector, which translates into smooth engine operation and correct injection characteristics. This solution is intended for users looking for a proven, original component for professional repair or replacement in a diesel fuel system.

Specifications and technical data

• SKU: A6560707000
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6560707000
• Substitutable numbers: A6560707000, A 656 070 70 00
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in a diesel fuel system

The fuel injection line in a diesel engine is responsible for the precise delivery of diesel fuel from the common rail to a specific injector. The OM656 units use an advanced high-pressure injection system, which is why the quality and tightness of the line have a direct impact on:

• stable injection pressure in a given cylinder,
• correct fuel dosing,
• engine refinement across the full load range,
• exhaust emissions and fuel consumption.

Selecting the correct injection line for a specific diesel engine is crucial for maintaining the factory performance parameters of the power unit and avoiding problems with starting, smoke, or power loss.

Construction and compatibility with the OM656 engine

The offered element has been designed as part of the fuel system in modern Mercedes diesel units, used in models such as the C-Class (W204) and S-Class (W222) with the OM656 engine. The construction of the line is adapted to the high operating pressures typical of common rail systems in diesel engines, with geometry and ends shaped for factory sockets in the rail and injector.

Such compatibility allows for:

• maintaining the correct routing of the line in the engine compartment,
• reducing stress and vibrations during engine operation,
• proper sealing of connections without the need for modifications.

Benefits of using an original fuel injection line

Using an injection line dedicated to a specific diesel engine brings measurable operational benefits. In the case of OM656 units, it is particularly important to maintain high injection precision, which is why the appropriate line helps to:

• minimize the risk of leaks in the fuel system,
• limit the possibility of micro-cracks resulting from high-pressure operation,
• maintain uniform operation of all cylinders,
• keep combustion parameters in line with the manufacturer's specifications.

For workshops and private users, this means more predictable diagnostics, easier tuning of the injection system, and a lower risk of warranty returns after repair.

Product characteristics and service application

The diesel fuel injection line from this offer comes from the Lines, Hoses and Pipes group, which means it is a strictly hydraulic element, without electronics or additional control modules. It works well both for standard replacement of a damaged line and for more extensive service work, such as:

• regeneration or replacement of injectors,
• repair of the common rail system after mechanical damage,
• removing leaks in the cylinder supply area,
• diagnostic work related to uneven engine operation.

The product is intended for Mercedes brand vehicles, which facilitates the selection of parts based on manufacturer markings and service documentation.

Condition and installation recommendations

The item is offered in used condition, which allows for an economical repair while maintaining the original manufacturer's specification. Before installation, it is recommended to thoroughly clean the sockets in the rail and injector, use appropriate tightening torques, and check for leaks after the first engine start. Proper installation has a direct impact on the durability of the line and the safety of the fuel system operation.

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 supply lines, return lines, or high-pressure pipes, check the available parts in the Mercedes Lines, Hoses and Pipes category.

For users interested in a broader look at drive component diagnostics and parts selection – including used ones – the guide article Clutch and dual-mass flywheel – diagnostics and selection of parts for the drivetrain may be helpful, as it facilitates understanding the relationships between individual sub-assemblies in modern drivetrains.