Mercedes-Benz W169 W245 Diesel OM640 Fuel Injector Rail Line A6400702395

The Mercedes A B W169 W245 CDI fuel rail is a precise component of the diesel engine fuel system, designed for installation in the front of the vehicle. The offered component from the injector nozzles category ensures stable diesel fuel supply to the CDI unit, which translates to even engine operation and proper cooperation with the injectors.

Specifications and technical data

• SKU: A6400702395
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6400702395
• Substitutable numbers: A6400702395, A 640 070 23 95, ŁS
• Location on the vehicle: Front
• Fuel type: Diesel
• Category: Fuel Injectors

Technical characteristics of the CDI fuel rail

The fuel rail in a Common Rail system is responsible for storing and distributing fuel under high pressure to individual injectors. In Mercedes A and B series W169 and W245 models with CDI engines, it is a key element ensuring:

• stable fuel pressure across the entire engine load range,
• precise diesel fuel metering to the injector nozzles,
• proper cooperation with the high-pressure components of the diesel fuel system.

Its location in the front of the engine bay facilitates service access and diagnostics, which is important for maintaining the injection system in vehicles used intensively in urban and non-urban traffic.

Application in the diesel injection system

The CDI fuel rail works with the high-pressure pump and injector nozzles, forming a cohesive diesel engine fuel supply system. A correctly selected component allows for:

• maintaining smooth engine operation at low and high RPMs,
• reducing vibrations and uneven running caused by fuel pressure fluctuations,
• improving the refinement of the CDI engine and idle stability.

The correct selection of the fuel rail for a specific engine and body version is particularly important for modern diesel engines, where the injection system operates under very high pressure and requires maintaining appropriate operating parameters.

Benefits of installing a used Mercedes fuel rail

Choosing a used fuel rail for a Mercedes A/B CDI is a solution that allows for optimizing repair costs while maintaining the original operating characteristics of the injection system. This type of component is particularly attractive when:

• maintaining compatibility with the original diesel engine components,
• reducing service costs while maintaining correct operating parameters,
• preserving the original fuel system configuration without the need for installation modifications.

For many CDI vehicle owners, this is a sensible compromise between operational economy and the technical requirements of a modern injection system.

Diagnostics and prevention of the injection system

Problems with the fuel rail or its cooperating injector nozzles can manifest as a loss of power, uneven engine operation, or increased fuel consumption. It is worth knowing the typical symptoms and verification methods to react in a timely manner and avoid more serious engine damage. A detailed discussion of this issue can be found in the article Diesel injector faults – how to recognize them and what are the consequences of neglecting them, which describes the symptoms, effects, and basics of diagnosing diesel injection systems.

Mercedes injector nozzles – selection and alternatives

When replacing the fuel rail, it is advisable to simultaneously assess the condition of cooperating components such as injector nozzles, high-pressure lines, or control accessories. If you are looking for other components from the same group, check the available Mercedes injector nozzles to select components compatible with your fuel system.

If you are considering whether original, aftermarket, or used parts would be a better choice, the guide Original, aftermarket, or used – which car parts are most cost-effective may be helpful, discussing the differences in cost, quality, and fit of parts selected by OEM numbers.