Audi A5 S5 8T Fuel Pipe Hose Line 4.2 V8 FSI CAUA Petrol 079127509AQ

The Audi A5 S5 8T Fuel Line 4.2 V8 FSI CAUA Gasoline is an original fuel system component designed for V8 FSI gasoline engines. Thanks to its precise fit to the factory installation, it ensures stable fuel delivery and maintains the engine's operating parameters according to the manufacturer's specifications. This is a solution for users who expect proven quality and reliable installation in their Audi A5 or S5 8T.

Specifications and technical data

• SKU: 079127509R
• Mark: Audi
• Condition: Used
• OEM Part Number: 079127509R
• Substitutable numbers: 079127509R, 079 127 509 R
• Fuel type: Petrol
• Part type: Pipe
• Category: Hoses, Lines & Pipes

Fuel Line Purpose and Function

This line belongs to the Lines, Hoses, and Tubes category and is responsible for safely delivering gasoline to the injection system in the 4.2 V8 FSI CAUA engine. The line's design is adapted for high-pressure systems typical of modern gasoline engines, which helps maintain proper fuel pressure and stable injector operation.

A properly selected fuel line reduces the risk of leaks, pressure drops, and starting problems, while also helping to maintain the engine's smooth operation and performance. Using a component that matches the original design is particularly important for high-power engines like the 4.2 V8 FSI.

Gasoline System Compatibility

The presented fuel line is designed to work with gasoline fuel, meaning it uses materials and cross-sections adapted to the chemical properties of gasoline and the operating pressures within the FSI system. This allows the line to work with factory engine components such as the fuel pump, fuel rail, and quick-connect fittings without requiring modifications.

Selecting a line that matches the design of the 4.2 V8 FSI CAUA engine allows for:

• correct fuel flow across the full range of loads,
• stable operating parameters of the injection system,
• consistency with the original routing of the installation in the engine bay.

Component Characteristics and Application Benefits

As an original Audi component, this fuel line has been designed with the specific A5/S5 8T body style and V8 FSI engine in mind. This means maintaining factory lengths, diameters, and routing geometry, which facilitates installation and minimizes the risk of stress on the system.

Using this line to replace a worn or damaged component allows for:

• restoring the proper sealing of the fuel system,
• reducing the risk of leaks and associated malfunctions,
• maintaining compliance with factory safety standards.

A used original part offers a reasonable compromise between cost and quality, especially for specialized fuel system components for V8 engines.

Practical Installation and Maintenance Tips

When replacing the fuel line in an Audi A5/S5 8T with a 4.2 V8 FSI CAUA engine, it is important to pay attention to the correct routing of the line in the factory guides and the secure seating of the connectors. Installation in a service environment is recommended, following procedures for bleeding and checking the gasoline system for leaks after starting the engine.

For users looking for other Audi lines, hoses, and tubes, a dedicated category has been prepared: Audi lines, hoses, and tubes, where you can find installation components for other models of this brand.

How to Optimize Service Costs

Owners of VAG group vehicles often combine original components with reasonably selected used parts to reduce operating costs without compromising quality. It is worth learning practical tips on choosing such elements – you will find them in the article how to save on original car parts for Volkswagen, which presents a universal approach to using the used parts market.