Injection Rail Mercedes W204 W212 OM651 High Pressure Fuel Rail A6510700700

Description

Injection Rail Mercedes W204 W212 OM651 High Pressure Fuel Rail is a precision fuel system component designed for OM651 diesel engines in Mercedes W204 and W212 models. As a component from the Fuel pumps and level sensors group, it is responsible for the stable distribution of fuel at the appropriate pressure to the injectors, which translates into smooth engine operation. Using a pre-owned part of this type allows for a technically correct repair of the injection system while maintaining the engine’s factory performance characteristics.

Specifications and technical data

• SKU: A6510700700-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510700700
• Substitutable numbers: A6510700700, A 651 070 07 00
• Fuel type: Diesel
• Category: Fuel Pumps & Sending Units

Purpose and role in the fuel system

The fuel rail in the OM651 Diesel engine acts as a common fuel manifold that buffers and distributes high-pressure fuel to individual injectors. A properly selected rail ensures:

• stable pressure across the entire engine load range,
• precise fuel dosing to each cylinder,
• reduction of pressure pulsations in the common rail system,
• maintenance of combustion parameters in accordance with the manufacturer’s specifications.

As a result, the engine maintains proper operating refinement, and throttle response remains predictable and consistent.

Compatibility with the OM651 engine

The presented fuel rail is designed for OM651 diesel engines used in Mercedes W204 and W212 models. Proper fitment to the specific engine version is crucial for:

• correct positioning of the injector supply ports,
• proper installation at existing mounting points on the cylinder head,
• maintaining the original geometry of high-pressure lines.

Selecting a rail compatible with the OM651 engine design reduces the risk of leaks, stress on the lines, and issues with bleeding the fuel system.

Benefits of using an original fuel rail

Using an original fuel rail in a Mercedes W204 or W212 allows you to maintain the injection system’s operating parameters at the level intended by the manufacturer. The most important advantages include:

• factory fitment for the OM651 engine fuel system,
• preservation of stock fuel pressure characteristics,
• compatibility with accessories from the Fuel pumps and level sensors group,
• possibility of performing repairs without interfering with the system’s design.

For workshops and users, this means predictable installation and easier diagnostics of any potential future faults.

Characteristics of the pre-owned component

The fuel rail offered as a pre-owned component is a solution that allows for cost-optimized repairs while maintaining the original technical specifications. In practice, this means:

• the ability to restore the efficiency of the injection system without the need to purchase a new part,
• maintaining compatibility with factory engine accessories,
• easier matching to the existing fuel installation.

Before installation, it is recommended to perform a standard system leak test and verify the correct operation of the entire common rail system on a diagnostic bench.

Technical support and related components

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 high-pressure lines, a supply pump, or additional common rail system components, check the available parts in the Mercedes Fuel pumps and level sensors category.

When selecting and installing fuel system components, it is also worth considering aspects related to engine control electronics. To better understand when it is worth opting for aftermarket components, check out our guide: A second life for electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?