Mercedes W203 OM646 Diesel Fuel Injector Rail Line A6460701695

The Mercedes W203 OM646 Fuel Rail is a component of the fuel supply system in diesel engines, responsible for the stable distribution of diesel fuel to the injectors. A properly selected fuel rail ensures uniform fuel pressure, which translates to smoother engine operation and proper response to load.

Specifications and technical data

• SKU: A6460701695
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6460701695
• Substitutable numbers: A6460701695, A 646 070 16 95
• Location on the vehicle: Front
• Fuel type: Diesel
• Category: Fuel Injectors

Purpose and Role in the Common Rail System

The fuel rail for Mercedes W203 with OM646 engine operates at the front of the engine bay, in close proximity to the high-pressure lines. Its task is to buffer and distribute high-pressure fuel to individual injectors, ensuring that each cylinder receives the correct amount of fuel at the same time.

Stable pressure in the fuel rail is crucial for:

• precise fuel metering across the entire RPM range,
• maintaining smooth diesel engine operation under varying loads,
• reducing vibrations and noise characteristic of diesel engines,
• proper cooperation with sensors and the engine control unit.

Category: Injector Nozzles and Fuel Supply System Components

Although the product is classified in the Injector Nozzles category, it is practically the central element of the fuel manifold in the Common Rail system. It works with injectors, the high-pressure pump, and sensors, forming a cohesive system responsible for preparing the fuel-air mixture.

A properly selected fuel rail in a diesel engine allows for:

• maintaining stable fuel pressure throughout the unit's operating range,
• reducing the risk of overheating and overloading injectors,
• more predictable vehicle behavior during sudden acceleration.

Compatibility with Diesel Engines and Placement

This fuel rail is designed for Diesel fuel supply systems, which require very high operating pressure and resistance to dynamic loads. Its placement at the front of the vehicle facilitates service access, diagnostics, and potential replacement without the need to interfere with deeper structural elements.

This design solution promotes:

• more efficient servicing in case of fuel injection system problems,
• easier leak testing of high-pressure lines and connections,
• safer routing of fuel lines away from excessively hot components.

Condition and Application in Mercedes Vehicles

The fuel rail comes from a Mercedes vehicle and is a used part, which in practice means a real possibility of economically repairing the fuel supply system while maintaining the original manufacturer's specifications. For many users, this represents a reasonable compromise between cost and maintaining factory engine performance parameters.

Before installation, it is recommended to:

• check the system for leaks and the condition of the high-pressure lines,
• verify the correct operation of the injectors and the high-pressure pump,
• check the fuel pressure parameters using an appropriate diagnostic tester.

Diagnostics and Prevention of the Injection System

Problems with the fuel rail or its cooperating injectors can manifest as uneven engine operation, power loss, or increased smoke. It is worth familiarizing yourself with practical tips for recognizing such faults – you can find them in the article Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails, which discusses typical symptoms, consequences, and diagnostic methods.

Other Mercedes Injector Nozzles

If you are looking for other Mercedes injector nozzles compatible with various models and engine configurations, check out our dedicated category: Mercedes injector nozzles. This will allow you to easily compare available solutions and select the appropriate part for your specific engine version.