BMW F07 F10 F11 F06 F12 F13 Diesel N57N N57Z Fuel Return Line Pipe 7823402

BMW F07 F10 F11 F06 F12 F13 Diesel N57N N57Z Fuel Return Line Pipe is an original fuel system component designed for BMW N57 diesel engines. This used part from the Lines, Hoses and Pipes category ensures proper fuel return from the fuel rail and injectors to the tank, supporting stable operation of the common rail system. It is a practical service solution for users looking for factory-fit quality without the need to invest in a new part.

Specifications and technical data

• SKU: 7823402-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7823402
• Substitutable numbers: 7823402, 13537823402, 11538572508, 17667823888, 8572508, 7823888, 7823401, 13537823401, 7823400, 13537823400
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The fuel return line in the N57 diesel engine is responsible for the safe discharge of excess fuel from the injection system components back to the tank. In BMW F-series diesel units, its proper operation affects:

• maintaining the correct pressure in the common rail system,
• stable injector operation under various loads,
• reducing the risk of air entering the fuel system,
• smooth engine operation across the entire rev range.

Using an original return line allows you to maintain the factory fuel flow characteristics, which is particularly important in modern diesel units.

Compatibility with the N57 diesel engine

The component has been designed to work with the N57 diesel engine used in BMW F-series models (including F07, F10, F11, F06, F12, F13). As a result, the line is structurally matched to the injection system, mounts, and fuel line routing in the engine bay.

The original BMW origin ensures the correct geometry, diameters, and connection points, which facilitates installation and minimizes the risk of leaks after replacement.

Benefits of using an original used line

Choosing a used fuel return line for a BMW with an N57 engine is a reasonable compromise between repair costs and maintaining factory quality. The main advantages of this solution include:

• factory fitment for the fuel system of a specific BMW generation,
• preservation of the original design and routing of the line in the engine bay,
• the possibility of economical fuel system repair while maintaining high functionality,
• reduced risk of installation problems typical of aftermarket parts with different geometry.

This is a practical service option, especially when the cause of the repair is leaks, mechanical damage, or wear of the existing return system.

Professional service application

The fuel return line in the N57 diesel engine is a component worth replacing during work related to injectors, the common rail, or fuel system upgrades. By using an original component, the mechanic gains:

• certainty of compliance with BMW factory specifications,
• easier installation thanks to the manufacturer-provided mounting points,
• consistency with other fuel system components.

This approach reduces service time and minimizes the risk of subsequent leaks or problems with engine performance.

Related categories and technical knowledge

If you are planning a comprehensive repair or upgrade of the fuel system area in your BMW and need other components from the same group, such as flexible supply lines, rigid fuel pipes, or additional return sections, check out the available parts in the BMW Lines, Hoses and Pipes category.

For a comparison of solutions used in different brands and to optimize fuel system repair costs, it is worth consulting technical materials. Useful information on the durability of diesel and gasoline units and the impact of used components on service budgets can be found in the article Volkswagen 1.9 TDI vs 1.4 TSI – evolution of VW engines and repair costs.