Audi A5 S5 8T 4.2 V8 FSI CAUA Fuel Injection Line Injectors Left N/S 079133315AP

Audi A5 S5 8T 4.2 V8 FSI CAUA Fuel Injection Line Injectors Left N/S is an original fuel system component designed for installation on the left side of the engine in Audi models equipped with the 4.2 V8 FSI engine. Thanks to its factory design, it ensures precise fuel delivery to the injectors and stable engine operation across the full load range. This solution is dedicated to users who expect a perfect fit and performance consistent with the manufacturer's standards.

Specifications and technical data

• SKU: 079133315AP
• Mark: Audi
• Condition: Used
• OEM Part Number: 079133315AP
• Substitutable numbers: 079133315AP, 079 133 315 AP, 079906036C, 079 906 036 C
• Location on the vehicle: Left
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The fuel injector rail in the Audi A5 / S5 8T with the 4.2 V8 FSI engine is responsible for the even distribution of fuel to individual cylinders and maintaining the correct operating pressure within the injectors. This component works in conjunction with the high-pressure pump, supply lines, and the injectors themselves, forming a cohesive fuel supply system for the FSI direct-injection gasoline engine.

Thanks to the factory design, the rail maintains the correct geometry of the fuel channels, which promotes stable engine operation, proper fuel metering, and reduces the risk of uneven cylinder performance. Its placement on the left side of the engine allows for the correct routing of lines, hoses, and pipes in the engine bay in accordance with the manufacturer's specifications.

Construction and mounting fitment

The offered fuel injector rail is a component from the Lines, hoses, and pipes group, designed specifically for use with the 4.2 V8 FSI unit in the Audi A5 / S5 8T. The construction provides precise mounting points to the cylinder head and properly spaced injector sockets, which facilitates correct seating of the component and minimizes the risk of leaks.

Factory fitment for the specific model and engine version means that the rail geometry, socket spacing, and fuel channel routing are consistent with the original vehicle configuration. This simplifies installation, reduces service time, and allows for maintaining the stock fuel system routing without the need for modifications.

Benefits of using an original injector rail

Using an original fuel injector rail in the Audi A5 / S5 8T 4.2 V8 FSI allows you to maintain engine performance at the level intended by the manufacturer. Compared to generic replacements, the factory component ensures:

• a secure fit to the cylinder head and injectors,
• proper fuel delivery across the entire RPM range,
• stable cooperation with other fuel system components,
• reduced risk of leaks and fuel pressure drops.

For users who value durability and predictable operation, it is important that the rail comes from the Audi brand, which translates into maintaining factory quality standards and compatibility with the engine control electronics.

Characteristics of the used component

The offered fuel injector rail is a used component, which allows for an economical repair of the fuel system while maintaining the original manufacturer's specifications. Such components are a popular choice when the priority is to combine reasonable costs with the preservation of factory construction and fitment.

During installation, standard service procedures are recommended: checking the injector sockets, replacing seals according to the manufacturer's recommendations, and verifying system tightness after starting the engine. This approach allows you to fully utilize the potential of the component and ensure stable fuel system operation.

Expanding the fuel system in your Audi

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other components from the same group, such as additional fuel lines, flexible supply hoses, or rigid supply pipes, check out the available parts in the Audi lines, hoses, and pipes category.

If you want to better plan your purchases and complete a larger set of original used parts in one place – from engine components to small mounting accessories – it is worth checking out our One-Stop-Shop guide: Comprehensive supply of used car parts.