BMW F20 F21 F30 F31 LCI B47 Pressure Hose Assy Fuel Injector 8579244

BMW F20 F21 F30 F31 LCI B47 Pressure Hose Assy Fuel Injector is an original fuel system component designed for the precise delivery of high-pressure fuel to the injector in the B47 engine. Thanks to its factory geometry and precise fitment for the specific BMW F20/F30 LCI generation, it ensures stable injection system performance and proper sealing of connections. This is a practical solution for users looking to restore the correct operation of the engine while maintaining manufacturer specifications.

Specifications and technical data

• SKU: 8579244
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8579244
• Substitutable numbers: 8579244, 13538579244, 8514159, 13538514159
• Category: Hoses, Lines & Pipes

Purpose and function in the injection system

The fuel injector pressure hose in the B47 engine is responsible for transporting fuel from the high-pressure rail directly to the injector. This component operates under demanding conditions, involving high pressure and variable temperatures, which is why its condition has a direct impact on:

• the stability of the fuel dose delivered to the cylinder,
• smooth engine operation across the entire RPM range,
• reducing the risk of leaks and pressure drops in the system,
• maintaining correct combustion and exhaust emission parameters.

Using a hose dedicated to the BMW F20/F30 LCI with the B47 engine allows for compliance with the factory fuel system design, which is particularly important during the diagnostics and servicing of diesel units.

Construction and fitment for BMW F20 F30 LCI B47

The offered hose belongs to the Hoses, pipes and lines category and has been designed as a high-pressure component, adapted for operation in modern common rail systems. Key design features include:

• factory-formed geometry, ensuring proper routing of the hose in the engine bay,
• connectors matched to the sockets in the rail and injector, which facilitates installation and service removal,
• material selected for resistance to operating pressure and thermal conditions near the cylinder head.

By maintaining the original specification, the hose works with factory mounting points and does not require any modifications to the fuel system.

Benefits of using an original BMW hose

Choosing a fuel injector pressure hose from the BMW OE range is a solution that helps maintain the integrity of the entire fuel system. Key advantages include:

• Compatibility with the B47 engine – the hose is designed for the specific engine configuration in F20/F30 LCI models, which minimizes the risk of installation issues.
• Factory flow parameters – maintaining the correct internal diameter and fuel flow characteristics promotes proper injector operation.
• Possibility of using interchangeable part numbers – facilitates part selection in service catalogs and verification of compatibility with a specific vehicle version.
• Consistency with other common rail system components, which is essential for comprehensive service maintenance.

Application in service and diagnostics

The fuel injector pressure hose should be replaced in situations where symptoms such as uneven engine operation, difficulty starting when warm, fuel leaks near the injector, or rail pressure errors occur. In service practice, hose replacement is often combined with:

• injector regeneration or replacement,
• inspection of the high-pressure rail,
• checking the tightness of the entire common rail system.

Using components that comply with factory specifications reduces the risk of the fault recurring and facilitates subsequent computer diagnostics.

Part condition and practical aspects

The offered hose is a secondary market component, which allows for economical repair while maintaining the original BMW design. Before installation, it is recommended to follow standard service procedures, including:

• inspecting the sockets and sealing surfaces,
• applying the correct tightening torques in accordance with technical documentation,
• checking the system for leaks after the first engine start.

This approach allows you to fully utilize the potential of the part and ensure stable engine operation after the repair.