Mercedes W166 W205 Fuel Injection Rail Line Right O/S M276.823 A2760781345

Mercedes W166 W205 Fuel Injection Rail Line Right O/S M276.823 is an original fuel system component designed for installation on the right side of the engine in selected Mercedes models. Thanks to its precise OEM design, the rail ensures stable operating conditions for the injectors and helps maintain correct combustion parameters, which translates into efficient, smooth engine operation and predictable throttle response.

Specifications and technical data

• SKU: A2760781345-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2760781345
• Substitutable numbers: A2760781345, A 276 078 13 45, A2760700500, A 276 070 05 00
• Location on the vehicle: Right
• Part type: Fuel Rail (Ramp)
• Category: Additional Fuel Injection Parts

Purpose and function of the fuel injection rail

The described fuel injection rail is a component of the fuel injection system for the M276 petrol engine family. Its task is to evenly distribute fuel to the injectors on the right side of the engine while maintaining appropriate operating parameters. A correctly selected rail helps maintain:

• stable fuel pressure within the injector section,
• repeatable fuel doses for individual cylinders,
• proper engine refinement across the full load range.

As a result, the injection system retains its factory characteristics, and the response to load remains predictable and in accordance with the manufacturer's specifications.

Compatibility and reference numbers

The rail has been designed for use in Mercedes SUV and mid-size vehicles, such as the W166 and W205, equipped with the appropriate version of the M276 engine. Using an original OEM design ensures the correct geometry of connections, mounting points, and port layout, which facilitates installation and reduces the risk of leaks.

The component has a dedicated part number and associated replacement numbers, which facilitates verification of compatibility with a specific vehicle configuration. Before purchasing, it is worth comparing the markings with service documentation or the removed part to ensure full compatibility with your specific vehicle.

Vehicle placement and installation aspects

The rail is intended for installation on the right side of the engine, in accordance with the factory layout of accessories in M276 units. This placement requires maintaining the correct sequence of disassembly and assembly of adjacent components to avoid putting stress on fuel lines or causing leaks at the connections.

During installation, it is recommended to:

• use new seals in accordance with the manufacturer's recommendations,
• thoroughly clean the seats and mating surfaces,
• check the correct routing of fuel lines and electrical harnesses around the rail.

This approach minimizes the risk of subsequent leaks and problems with starting or uneven engine operation.

Characteristics of the used product

The offered fuel injection rail is a used component, sourced from dismantling. This type of part is a sensible choice for repairs where maintaining the original manufacturer's specification while optimizing costs is key. In the case of injection system components, using an original part from the secondary market often ensures a better fit than aftermarket replacements of unknown origin.

Before installation, a standard visual inspection is recommended, checking the condition of the ports, threads, and connection seats, as well as verifying tightness after installation in the vehicle. Such procedure allows for safely utilizing the part's potential and restoring the proper operation of the fuel system.

Expansion of the Mercedes injection system

If you are planning a comprehensive repair or upgrade of the injection system area in your Mercedes and need other elements from the same group, such as additional rails, fuel lines, or supply components, check the available parts in the Other Mercedes injection system parts category.

Technical knowledge and part selection

When working with advanced injection systems, it is worth relying on reliable technical knowledge and experience with various engine units. For a comparison of the characteristics of modern diesel engines and to understand the impact of engine design on accessory durability, the article comparing popular BMW units may be helpful – BMW N47 vs M57 / M57N / M57N2 – a ranking of legendary diesels. Although it concerns a different brand, it allows for a better understanding of the relationships between engine design, the injection system, and operating costs.