Audi S5 8T 4.2 FSI Fuel Injection Rail Line Injectors Pipe Left N/S 079133315S

The Audi S5 8T 4.2 FSI Fuel Rail Injectors Injector Left is an original gasoline fuel system component designed for the 4.2 FSI engine in the Audi S5 8T model. This product, from the Injector Nozzles category, ensures precise fuel delivery to the cylinders on the left side of the engine, contributing to stable engine operation and proper performance. It is a solution dedicated to users who expect factory fitment and consistency with the original injection system configuration.

Specifications and technical data

• SKU: 079133315S
• Mark: Audi
• Condition: Used
• OEM Part Number: 079133315S
• Substitutable numbers: 079133315S, 079 133 315 S
• Location on the vehicle: Left
• Fuel type: Petrol
• Category: Fuel Injectors

Purpose and Function in the Injection System

The fuel rail with injectors on the left side of the 4.2 FSI engine is responsible for the even distribution of gasoline to individual cylinders in that bank. A correctly selected component of this type is crucial for:

• maintaining the correct fuel pressure in the supply section on the left side of the V8 unit,
• stable engine operation across the entire RPM range,
• the correct air-fuel mixture composition,
• reducing the risk of misfires and rough idling.

Thanks to its design, which is consistent with the original Audi project, the rail works with the factory control electronics and other components of the gasoline fuel system.

Compatibility with Audi S5 8T 4.2 FSI

The presented fuel rail has been specifically designed for the Audi S5 8T with the 4.2 FSI engine, meaning it retains the original mounting geometry and injector spacing. Its placement on the left side of the vehicle allows for direct integration with the factory intake manifold and fuel lines, without the need for installation modifications.

This precise fitment is particularly important in high-performance engines, where the accuracy of gasoline delivery directly impacts the smoothness of operation, throttle response, and thermal safety of the powertrain.

Technical Characteristics and Installation

The fuel rail with injectors belongs to the Injector Nozzles category, highlighting its role as a component responsible for shaping the fuel spray and proper atomization of gasoline in the combustion chamber. The use of dedicated injectors for the 4.2 FSI unit allows for the maintenance of operating parameters as intended by the vehicle manufacturer.

Its placement on the left side of the engine facilitates servicing and diagnostics – access to the rail is consistent with the factory equipment layout, and installation follows standard workshop procedures for this model. The product is intended for systems powered by gasoline, which is consistent with the characteristics of the FSI engine.

Component Condition and Practical Application

The offered fuel rail with injectors is a used component, making it an attractive option for repairs and overhauls of the fuel system in the Audi S5 8T 4.2 FSI. This type of component is suitable for both replacing a damaged left-side rail and for a comprehensive engine renovation where maintaining the original specification is important.

Choosing an original solution from this category helps reduce the risk of fitment issues and also simplifies subsequent computer diagnostics and mechanical servicing of the injection system.

Technical Support and Additional Information

When modernizing or repairing the gasoline fuel system in an Audi, it is also worth paying attention to other components from the same group, such as additional rails, injectors, or associated hardware. If you are looking for other parts from the injector nozzles category dedicated to this brand, check the available parts in the Audi Injector Nozzles category.

For comparison with diesel systems and a better understanding of the differences in symptoms and diagnostics of injectors, an article describing common problems in diesel engines may be helpful – more information can be found in the entry Diesel Injector Failures – How to Recognize Them and What Their Neglect Entails.

If you are planning a more extensive restoration of a car from the years when the Audi S5 8T was produced, a guide on using used components in refreshing youngtimer vehicles may also be an inspiration – details can be found in the article Second Life for a Youngtimer – How Used Car Parts Revitalize Cars from 1998–2012.