BMW F20 F21 F30 F31 LCI Pressure Hose Assy Fuel Injector 8579242

The BMW F20 F21 F30 F31 Fuel Injector Pressure Line is an original BMW component designed for precise delivery of high-pressure fuel to the injector. A used line from this series is a sensible choice for drivers who want to maintain the factory engine performance characteristics while optimizing service costs.

Specifications and technical data

• SKU: 8579242
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8579242
• Substitutable numbers: 8579242, 13538579242, 8514165, 13538514165
• Category: A/C Hoses & Fittings

Purpose and Function of the Pressure Line

The fuel injector pressure line in BMW F20, F21, F30, and F31 models is responsible for a stable, leak-proof, and load-resistant connection between the fuel system and the injector. The high-pressure operation requires a component with appropriate design, ensuring that:

• proper fuel pressure is maintained across the entire RPM range,
• the risk of leaks and power loss is reduced,
• the engine maintains smooth operation and even combustion.

Selecting a line dedicated to specific generations of BMW 1 and 3 Series ensures compliance with the manufacturer's original specifications.

Original BMW Origin and Replacement Numbers

The offered component comes from the BMW OE line, meaning it is a part designed and manufactured according to the manufacturer's internal standards. The line has an assigned OEM part number and associated interchangeable numbers, making it easy to verify its compatibility with a specific engine configuration and vehicle year.

In practice, this means:

• certainty of fit with the fuel system in the given model,
• no need for modifications or adaptations during installation,
• quick identification using reference numbers in BMW catalogs.

If you are considering a choice between a used OEM part and an aftermarket replacement, it is worth reviewing the practical arguments described in the article 5 Reasons Why a Used OEM Part is a Better Choice Than an Aftermarket Replacement.

Condition, Verification, and Preparation for Installation

The line is offered as a used original part, which in the case of fuel systems represents a real saving while maintaining factory geometry and build quality. Before being offered for sale, the part is visually inspected for mechanical damage, deformation, and visible signs of leaks.

Due to the nature of the pressure line's operation, installation in a specialized service center is recommended, following manufacturer procedures, including:

• using appropriate tightening torques,
• checking injector seats and the fuel rail,
• verifying system tightness after starting the engine.

Benefits of Using an Original BMW Line

Using a fuel injector pressure line from BMW OE translates into a number of practical benefits:

• Factory Fitment – maintaining the original routing of the line and the correct geometry of connections.
• Stable Fuel System Operating Parameters – reducing the risk of pressure drops and starting issues.
• Optimized Service Costs – a used OEM part allows for reduced repair costs without compromising quality.

If you are looking for other BMW air conditioning lines, hoses, and connectors, check out our dedicated category: BMW air conditioning lines, hoses, and connectors.

Used Premium Parts and Repair Economics

Choosing used, original parts for premium cars is an increasingly common practice – it allows for maintaining the vehicle's high technical standard with reasonable financial outlay. This mechanism is well illustrated by an article on the Mercedes-Benz brand, which describes the advantages of using original dismantled components, such as air conditioning compressors or control modules: Used Parts for Mercedes – Original Dismantled Parts. A similar approach also works for BMW fuel systems, where maintaining factory operating parameters is crucial.