Mercedes W176 W204 W212 W246 Diesel Engine OM651 Fuel Injection Rail A6510701595

The Mercedes W176 W204 W212 W246 Diesel OM651 fuel rail is a precision component of the fuel system for diesel engines, designed specifically for OM651 units. It is responsible for the stable supply of diesel injectors, which translates into smooth engine operation, proper running culture, and predictable performance in everyday use.

Specifications and technical data

• SKU: A6510701595-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510701595
• Substitutable numbers: A6510701595, A 651 070 15 95, 0 445 214 275
• Fuel type: Diesel
• Category: Fuel Injectors

Purpose and Role in the Common Rail System

The fuel rail in the OM651 diesel engine plays a key role in the Common Rail system – it stores fuel under high pressure and distributes it to individual injectors. In Mercedes A-Class, C-Class, E-Class, and B-Class vehicles from the W176, W204, W212, and W246 families, it ensures:

• stable fuel pressure across the entire engine load range,
• precise injector supply under varying driving conditions,
• more even combustion, which contributes to the engine's running culture.

Thanks to its carefully designed geometry and flow channels, the fuel rail works in conjunction with the engine control system, enabling the maintenance of set pressure parameters in the high-pressure system.

Compatibility with OM651 Diesel Engine

The presented fuel rail is designed for Diesel OM651 engines used in selected Mercedes W176, W204, W212, and W246 models. Using a dedicated component for this engine means:

• maintaining factory operating parameters of the injection system,
• proper cooperation with injectors and fuel pressure sensors,
• consistency with the engine control unit software, without the need for injection map modifications.

Selecting a fuel rail dedicated to a specific type of diesel engine reduces the risk of starting problems, power drops, or unstable idling.

Category: Injector Nozzles and Fuel System

Although the main component is the fuel rail, the product belongs to the injector nozzles category, which are components directly related to precise fuel delivery. Replacing the fuel rail is often done concurrently with injector diagnostics or refurbishment because:

• incorrect fuel rail pressure can affect injector nozzle operation,
• contaminants in the system can cause uneven operation of individual cylinders,
• a correctly selected fuel rail helps maintain stable parameters throughout the entire fuel system.

If you need other components from the injector nozzles category for this brand, check the available Mercedes injector nozzles to complete the entire injection system in your vehicle.

Used Condition – Practical Benefits

The fuel rail is offered in used condition, which represents a reasonable compromise between cost and functionality. For many users, this means:

• lower repair cost compared to a new component,
• the possibility of quick replacement in case of fuel system failure,
• maintaining the original specification characteristic of salvaged parts.

When selecting used fuel system components, it is worth paying attention to correct part identification and compatibility with the specific engine version and vehicle year.

Diagnostics and Operation of the Injection System

Problems with the fuel rail or diesel injectors often manifest as starting difficulties, power loss, smoking, or uneven engine operation. To better understand the relationships between the fuel rail and injectors, and the consequences of neglect, it is worth reading the article Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails, which discusses typical symptoms, diagnostic methods, and the consequences of prolonged driving with a faulty system.

If you are considering a broader upgrade or repair using aftermarket components, the guide Buying Used Car Parts and Common Mistakes When Choosing Parts for Tuning may also be helpful, offering advice on how to make informed choices about used parts to avoid future problems.

Summary

The Mercedes W176 W204 W212 W246 Diesel OM651 fuel rail is a specialized component of the Common Rail system, designed for diesel engines of this series. A properly selected and correctly installed fuel rail helps maintain stable fuel pressure, supports smooth engine operation, and serves as an important starting point for comprehensive servicing of the injection system in Mercedes vehicles with the OM651 diesel engine.