Audi A5 S5 8T 4.2 V8 FSI CAUA Fuel Injection Line Left N/S 079133316AP

The Audi A5 S5 8T 4.2 V8 FSI CAUA Fuel Injector Line Left is an original gasoline fuel system component, designed for precise fuel delivery to the injectors on the left side of the engine. Thanks to its factory geometry and fitment for the 4.2 V8 FSI unit, it ensures stable fuel pressure and proper operation of the entire injection system. A used OEM component allows for a technically correct repair without altering the engine's construction.

Specifications and technical data

• SKU: 079133316AP-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 079133316AP
• Substitutable numbers: 079133316AP, 079 133 316 AP
• Location on the vehicle: Left
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Purpose and Function in the Fuel System

The left fuel injector line in an FSI gasoline engine is responsible for the controlled transport of fuel from the fuel rail to the respective injectors on one side of the V8 unit. A correctly selected component minimizes the risk of leaks, pressure drops, and fuel metering disruptions, which translates to smooth engine operation, proper idle quality, and predictable throttle response.

For high-performance engines like the 4.2 V8 FSI, the correct injector line is crucial for maintaining stable operating parameters under heavy load and during dynamic acceleration.

Construction and Fitment for Audi A5 / S5 8T

This line belongs to the group of Lines, Hoses, and Tubes, specifically designed for Audi fuel systems. Its original geometry and mounting points are adapted to the 4.2 V8 FSI engine architecture in the A5 / S5 8T generation models, facilitating installation and maintaining the factory routing of fuel lines.

Its placement on the left side of the engine ensures compatibility with the factory layout of accessories, wire routing, and covers. This prevents the line from interfering with other engine bay components and allows it to operate under the manufacturer-intended thermal conditions.

Performance Parameters and Benefits of Use

The line is designed for systems powered by gasoline fuel, guaranteeing material compatibility with FSI engine requirements. Using an original used component allows for:

• maintaining correct pressure in the injection system on the left side of the engine,
• reducing the risk of fuel leaks in the high-pressure area,
• preserving the factory operating parameters of the 4.2 V8 FSI unit,
• avoiding fitment issues typical of aftermarket parts with imprecise geometry.

This solution is particularly recommended for fuel system repairs where compliance with the manufacturer's service documentation is required.

Condition, Verification, and Service Application

This part is a used component, offered as a used fuel injector line, providing a cost-effective alternative while maintaining original specifications. This type of part is suitable for both standard replacement of a damaged line and for a comprehensive overhaul of the fuel system in an Audi A5 / S5 8T gasoline engine.

Selection based on the OEM number and compatibility with the 4.2 V8 FSI CAUA unit allows the service center or user to confidently match the component to the specific vehicle configuration without the need for fuel system modifications.

System Expansion – Related Components

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other parts from the same group, such as supply lines, return hoses, or fuel distribution tubes, check the available parts in the Audi Lines, Hoses, and Tubes category.

For users interested in a broader approach to original used parts and selection procedures based on manufacturer numbers, an article describing practices used in the BMW brand may be helpful – you can find it here: BMW – Sporty Performance and Precision. How Original Used Parts Extend the Life of the Bavarian Icon?.