Mercedes W204 C220 CDI OM646 Diesel Fuel Intake & Return Line Pipes A6460700632

Mercedes W204 C220 OM646 Fuel Supply and Return Lines are factory fuel system components designed for the OM646 diesel engine, ensuring stable flow and safe diesel fuel return. Thanks to precise fitting for the specific engine unit and the use of solutions compliant with manufacturer requirements, these lines maintain the correct operating parameters of the injection system. This is a practical choice for servicing or replacing worn sections of the fuel system in the W204 C-Class model.

Specifications and technical data

• SKU: A6460700632-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6460700632
• Substitutable numbers: A6460700632, A 646 070 06 32, A6460701732, A 646 070 17 32, A6460781981, A 646 078 19 81, A6460781781, A 646 078 17 81
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and Function in the Fuel System

The offered lines belong to the group of Lines, Hoses, and Tubes and are part of the fuel supply and return system in a diesel engine. They are responsible for transporting diesel fuel between key injection system components and for draining excess fuel back into the circulation, which affects pressure stability and proper injector operation.

In diesel engines, such as the OM646, correctly selected fuel lines are crucial for:

• maintaining the integrity of the supply system under variable operating pressure,
• reducing the risk of air entering the system,
• ensuring uniform fuel return from the rail and injectors,
• stable engine operation across the full range of loads.

Compatibility with OM646 Diesel Engine

The lines are designed to work with the OM646 diesel engine used in the Mercedes W204 C220. The design and connection diameters are adapted to the characteristics of the diesel injection system, which facilitates installation and reduces the need for additional modifications. Using a dedicated solution instead of universal replacements helps maintain the original operating parameters of the engine unit.

The component has an assigned OEM part number and related interchangeable numbers, which facilitates verification of compatibility with the specific vehicle configuration and year. This allows for precise selection of lines for the existing fuel system without the risk of improper fit.

Performance Characteristics and Benefits of Use

As an original Mercedes part, the set of fuel supply and return lines ensures consistency with the factory architecture of the engine bay. Proper routing of the fuel lines reduces vibrations, minimizes stress on connections, and lowers the risk of abrasion during prolonged use.

Key benefits of using this solution include:

• maintaining the original routing geometry of the lines in the engine bay,
• easier diagnosis of potential leaks due to predictable line paths,
• compatibility with OM646 engine accessories without the need for adaptation,
• the ability to restore proper fuel system operation after a failure or wear of previous lines.

The product is offered in used condition, allowing for economical repair while maintaining the original design specification.

Professional Installation and Service Application

Fuel supply and return lines in a diesel engine operate under demanding temperature and pressure conditions, so during installation, it is important to pay attention to their correct placement relative to other accessory components. It is recommended to:

• perform a visual inspection of quick-connect fittings and seals,
• route the lines according to the factory mounting points,
• avoid twisting or excessive bending of the working sections,
• conduct a leak test of the system after starting the engine.

This approach allows for full utilization of the lines' potential and reduces the risk of subsequent leaks or starting problems, which is particularly important in diesel engines.

Fuel System Expansion and Additional Materials

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional fuel line sections, flexible hoses, or rigid guide tubes, check the available parts in the Mercedes Lines, Hoses, and Tubes category.

If you are considering further engine modifications and want to better understand how to use used components to improve performance, a guide to engine tuning may be helpful. It is available in the article How to Increase Engine Power: A Practical Guide to Tuning Engines with Used Parts, which discusses practical aspects of selecting and installing components in diesel-powered vehicles.