The Audi S7 4G8 4.0 TFSI Left Fuel Rail Injectors is an original gasoline fuel system component, designed for installation on the left side of the engine. This product from the Injector Nozzles category ensures stable fuel supply to the cylinders, which translates to proper engine operation and predictable performance.
Specifications and technical data
- SKU: 079133315BD
- Mark: Audi
- Condition: Used
- OEM Part Number: 079133315BD
- Substitutable numbers: 079133315BD, 079 133 315 BD, 079 906 036 N, 079906036N
- Location on the vehicle: Left
- Fuel type: Petrol
- Category: Fuel Injectors
Purpose and Role in the Fuel System
The fuel rail with injectors is responsible for the precise distribution of gasoline to the individual cylinders of the 4.0 TFSI engine. Maintaining proper pressure and uniform fuel delivery is crucial for:
- stable engine operation across the entire RPM range,
- correct mixture composition and efficient combustion,
- limiting knock combustion in turbocharged units,
- maintaining factory performance and throttle response in the Audi S7 model.
This component works with other fuel system components, creating a cohesive system responsible for the dynamic yet predictable operating characteristics of the gasoline engine.
Construction and Vehicle Placement
The presented fuel rail is designed for installation on the left side of the engine unit. This placement is significant for both installation and servicing – proper side selection minimizes the risk of fitting issues and fuel system leaks.
The injectors integrated into the rail form an integrated working unit that:
- delivers fuel directly to the intake ports or combustion chamber according to the ECU map,
- maintains uniform supply to all cylinders served by that side of the rail,
- limits pressure drops during dynamic engine load changes.
Operating Parameters and Gasoline Engine Compatibility
The rail is designed to work with the gasoline fuel system in the 4.0 TFSI engine. This means it is adapted to:
- direct injection characteristics in turbocharged units,
- high operating pressures typical of modern gasoline systems,
- precise control of injection timing and quantity by the engine control unit.
By maintaining factory specifications, using this fuel rail with injectors allows for the preservation of ECU calibration consistency, which is important for both daily operation and potential software modifications.
Condition, Service Application, and Benefits of Replacement
The offered component is a used part, making it an attractive option for fuel system servicing in the Audi S7 4G8 4.0 TFSI. Replacing the fuel rail with injectors is particularly advisable when symptoms such as:
- uneven engine idle,
- loss of power or hesitation during acceleration,
- increased fuel consumption compared to typical values for the model.
Choosing a component from the same design family helps reduce installation time and maintain factory routing of fuel lines and injector electrical connectors.
Audi Injector Nozzles – Selection and Offer
If you are looking for other components from the Audi injector nozzles category, check out our dedicated offer: Audi injector nozzles. You will find a wide selection of fuel supply system components tailored to various models of this brand.
Technical Support and Fuel System Knowledge
To better understand the importance of functional injectors and the entire fuel delivery path, it is worth familiarizing yourself with the guide material discussing the diagnostics and operation of fuel components: Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair.
Although the article discussed primarily concerns diesel units, much of the information regarding symptoms and consequences of injector malfunctions is general and can also be helpful when assessing the condition of components in gasoline engines: Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails.
