Mercedes W169 W245 High Pressure Injection Fuel Rail Diesel OM640 A6400702095

Mercedes W169 W245 High Pressure Injection Fuel Rail Diesel OM640 is a precision fuel system component designed for Mercedes diesel engines from the OM640 family. This used fuel rail ensures stable fuel distribution to the injectors, which translates into smooth engine operation and correct combustion characteristics. This solution is dedicated to users looking for a technically verified component at an attractive price point.

Specifications and technical data

• SKU: A6400702095
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6400702095
• Substitutable numbers: A6400702095, A 640 070 20 95, A 640 070 12 95, A6400701295, A 640 070 23 95, A6400702395
• Fuel type: Diesel
• Part type: Pipe
• Category: Hoses, Lines & Pipes

Purpose and role of the fuel rail

The fuel rail in a diesel engine plays a key role in the common rail system – it stores fuel under high pressure and distributes it to individual injectors. In OM640 units, the use of a properly selected rail allows for maintaining:

• stable fuel pressure across the entire engine load range,
• repeatable injection doses for each cylinder,
• proper refinement of the diesel unit's operation. Thanks to this, the diesel fuel system maintains proper parameters, which helps to preserve power, torque, and correct throttle response.

Benefits of using an original fuel rail

Using a rail dedicated to the OM640 engine in Mercedes W169 and W245 models allows for maintaining the factory operating characteristics of the engine. A properly selected element from the Lines, hoses and pipes group influences:

• proper cooperation with sensors and fuel system accessories,
• maintenance of pressure parameters required by the engine control unit,
• reduction of the risk of starting problems and rough idling. This is particularly important in modern diesel units, where the precision of fuel dosing has a direct impact on exhaust emissions and fuel consumption.

Technical characteristics and compatibility

The rail has been designed to work with a diesel engine, which means it is adapted to the high operating pressures typical of common rail systems. The appropriate geometry of the connections and the arrangement of the ports allow for correct integration into the existing fuel installation in the engine bay without the need for modifying the lines. The presence of the OEM part number and available replacement numbers facilitates verification of compatibility with a specific vehicle configuration. Before purchasing, it is worth comparing the markings with service documentation or the removed component to ensure full compatibility with the given car model.

Product condition and service application

The offered fuel rail is a used component, which allows for an economical repair of the fuel system while maintaining the manufacturer's original specifications. This type of component will work well both when replacing a damaged rail and during comprehensive maintenance of the fuel system in an OM640 engine, e.g., in case of fuel pressure problems or errors related to injection operation. Choosing an original Mercedes brand element from this parts group reduces the risk of mismatch and facilitates subsequent computer diagnostics, as the system's operating parameters remain consistent with factory assumptions.

Expanding the fuel system in a Mercedes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as supply lines, flexible fuel hoses, or rigid return pipes, check the available parts in the Mercedes lines, hoses and pipes category.

How to choose the right used fuel rail

When selecting a used fuel rail for a diesel engine, it is crucial to verify compatibility with the engine unit, model year, and vehicle equipment version. It is worth paying attention to:

• compliance of OEM markings and reference numbers,
• type of injection system used,
• fuel type and engine generation. To better understand how to professionally select used components and avoid unsuccessful purchases, it is worth using the expert advice available in the article No more bad purchases! How to professionally select used car parts, where, among other things, the importance of OEM and reference number compliance is discussed.