Injection Fuel Rail Audi A7 S7 4G8 4.0 TFSI Left N/S Injector Line 079127507BK

The Audi A7 S7 4G8 4.0 TFSI Left Fuel Injector Pipe is an original gasoline fuel system component designed for precise fuel delivery to the injectors on the left side of the engine. This solution is engineered for stable operation of the 4.0 TFSI unit and to maintain the factory performance characteristics of Audi A7 and S7 models.

Specifications and technical data

• SKU: 079127507BK
• Mark: Audi
• Condition: Used
• OEM Part Number: 079127507BK
• Substitutable numbers: 079127507BK, 079 127 507 BK
• Location on the vehicle: Left
• Fuel type: Petrol
• Category: Fuel Injectors

Purpose and Function in the Fuel System

The Left Fuel Injector Pipe operates within the gasoline system, responsible for uniform fuel distribution to the injectors on one side of the V8 TFSI engine. A correctly selected component in this area is crucial for:

• stable fuel pressure in the rail supplying the injectors,
• consistent gasoline delivery to each cylinder on the left side,
• maintaining engine smoothness under load and across the full RPM range.

Choosing the right pipe for a specific 4.0 TFSI engine version minimizes the risk of leaks, power loss, and engine control unit errors related to the fuel system.

Compatibility with the 4.0 TFSI Unit

This component is specifically designed for use in the 4.0 TFSI gasoline engine found in the 4G8 generation Audi A7 and S7. This includes:

• geometry tailored to the V8 layout and the positioning of injectors on the left side,
• appropriate diameter and cross-section of channels ensuring proper fuel flow,
• compatibility with factory mounting points and support locations in the engine bay.

This precise fit allows for installation without modifications, maintaining original line routing and without interfering with other fuel system components.

Technical Characteristics and Installation

The pipe operates in the gasoline system, in an area of elevated temperature and pressure, therefore its construction is designed to work with Audi's factory fuel injection system. Its placement on the left side of the vehicle requires correct orientation during installation to:

• ensure proper sealing of connections to the rail and injectors,
• avoid mechanical stress resulting from improper positioning,
• maintain a safe distance from hot and moving components.

Professional installation using appropriate torque specifications and new seals (if required for the specific vehicle) will restore the fuel system's factory operating parameters.

Component Condition and Service Application

The offered pipe falls under the category of injector nozzles and is intended for service applications in Audi vehicles equipped with the 4.0 TFSI gasoline engine. It is suitable for replacing a damaged line as well as for comprehensive fuel system servicing when restoring sealing and correct flow parameters is necessary.

Replacing this component is particularly recommended when symptoms such as rough engine operation, fuel odor in the engine bay, or signs of leaks around the left-side injectors appear.

Technical Support and Additional Materials

If you are looking for other components in the Audi Injector Nozzles category, check out the Audi Injector Nozzles available in our store to find a complete solution for your fuel system.

To deepen your knowledge of diagnostics and common issues with fuel injection systems, we recommend reading the blog article Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails, which discusses typical symptoms and consequences of neglecting fuel injection issues (many diagnostic principles remain similar for gasoline systems).