BMW X5 X6 F15 F16 3.0 N57 Diesel Fuel Return Line Pipe Tube Hose 8508087

BMW X5 X6 F15 F16 3.0 N57 Diesel Fuel Return Line Pipe Tube Hose is an original component from the Lines, hoses and pipes group, designed for diesel systems in modern BMW models. It ensures a stable return of fuel from the fuel rail and injectors to the tank, which supports the smooth operation of the 3.0 N57 unit and reduces the risk of leaks in the fuel circuit.

Specifications and technical data

• SKU: 8508087
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8508087
• Substitutable numbers: 13538508087, 8508087
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The offered fuel return line is dedicated to Diesel engines in BMW X5 F15 and X6 F16 models with the 3.0 N57 unit. It is responsible for the controlled transport of excess fuel from the fuel injection system components back to the tank, stabilizing operating pressure and supporting proper component cooling.

A properly selected return line reduces the risk of air entering the system, facilitates starting on both warm and cold engines, and helps maintain smooth engine operation across the entire load range.

Construction and performance parameters

As an element from the Lines, hoses and pipes group, the line has been designed for operation in a diesel fuel environment, taking into account the variable temperatures and vibrations characteristic of diesel units. The design of the line is optimized for:

• resistance to diesel fuel and additives,
• dimensional stability during operating temperature changes,
• tightness of connections with fuel injection system components,
• resistance to vibrations and micro-cracks during long-term operation.

Thanks to the factory fitment for the specific N57 engine configuration, the line maintains proper routing in the engine bay, which facilitates installation and minimizes the risk of chafing against adjacent components.

Characteristics of the used component

The line is offered in used condition, which allows for an economical repair of the fuel system while maintaining the manufacturer's original specifications. This type of component, sourced from dismantling, is an attractive alternative to new replacements, especially for vehicles used intensively or in fleets.

Choosing an original used line allows for maintaining compatibility of geometry, diameters, and connector types with the factory fuel installation, which reduces the need for modifications and speeds up service work.

Benefits of using an original fuel return line

Using a fuel return line dedicated to the BMW X5 and X6 with the N57 engine provides a number of practical service and operational benefits:

• Factory fitment – compatibility with the fuel system of a specific vehicle generation, without the need for adaptation.
• Stable fuel system operation – proper fuel return helps maintain correct pressure and smooth injector operation.
• Reduced risk of leaks – properly selected diameters and connector types reduce the probability of leaks.
• Economical repair – an original used component allows for reducing service costs while maintaining high manufacturing quality.

Support with selection and additional information

When selecting a fuel return line for a specific version of the BMW X5 or X6 with the N57 engine, it is worth verifying compatibility with the engine unit designation and the fuel injection system configuration. Vehicle identification data and information about the fuel type, which in this case clearly points to a Diesel system, can be helpful.

If you are planning a comprehensive repair or upgrade of the fuel system area in your BMW and need other elements from the same group, such as flexible hoses, rigid pipes, or connecting sections, check the available parts in the BMW Lines, hoses and pipes category.

For users considering a wider use of recycled parts in vehicle service, an article describing the principles of safe selection of used components may be useful – you can find more practical tips in the material on the optimal selection of proven used parts for the braking system.