Audi A6 C6 RS4 B7 High Pressure Fuel Pump 4.2 FSI Petrol Left N/S 079127025C

Audi A6 C6 RS4 B7 High Pressure Fuel Pump 4.2 FSI Petrol Left N/S is an original component from the High Pressure Fuel Pumps group, designed for 4.2 FSI petrol engines. It enables stable fuel supply to the power unit under high pressure, which is crucial for precise injection and proper operation of the fuel system. This solution is dedicated to Audi vehicles, designed for specific models and configurations.

Specifications and technical data

• SKU: 079127025C
• Mark: Audi
• Condition: Used
• OEM Part Number: 079127025C
• Substitutable numbers: 079127025C, 079 127 025 C, 079 127 025 AF, 079127025AF
• Location on the vehicle: Left
• Fuel type: Petrol
• Part type: High Pressure Pump
• Category: High Pressure Fuel Pumps

Purpose and function in the fuel system

The presented high-pressure pump operates in the fuel system of a petrol engine with direct FSI injection, where it is responsible for increasing fuel pressure from a low level (in-tank pump) to the values required by precise injectors. The left-side positioning allows for proper integration with the engine cylinder head and the pump drive, ensuring stable operating parameters across the full load range. Thanks to the factory fitment for the 4.2 FSI unit, the pump works with the original fuel rail, engine control unit, and accessories, which reduces the risk of problems with pressure regulation, uneven engine operation, or control unit errors.

Construction and compatibility with Audi A6 C6 / RS4 B7

The pump has been designed specifically for use in Audi A6 C6 and RS4 B7 models with the 4.2 FSI petrol engine. This means appropriate mounting points, correct fuel connections, and an electrical connector compatible with the vehicle's factory wiring harness. Such compatibility facilitates installation and allows for maintaining the original geometry of the fuel system. As a component from the High Pressure Fuel Pumps group, this unit works with the factory fuel pressure control, allowing for the maintenance of parameters specified by the vehicle manufacturer. This is particularly important in high-power engines, where fuel pressure stability has a direct impact on performance and engine refinement.

Benefits of using an original high-pressure pump

Using a dedicated high-pressure pump in the 4.2 FSI engine brings a number of practical benefits:

• maintaining factory fuel pressure parameters throughout the entire rev range,
• proper cooperation with injectors and the engine control unit,
• reducing the risk of hot and cold start problems,
• stable operation of the power unit during dynamic acceleration. For Audi A6 C6 and RS4 B7 users, it is important that using the correct pump allows for maintaining engine performance characteristics consistent with the manufacturer's specifications, which translates into predictable throttle response and a correct air-fuel mixture.

Operational characteristics and installation

The pump is designed to work with petrol fuel, in accordance with the FSI system design. Installation in the left-side position requires following the correct sequence of connecting fuel lines and the electrical connector, as well as bleeding the system after installation. It is recommended to use new seals and check the condition of the cooperating fuel system components. Due to the specific nature of high-pressure fuel pump operation, it is important to use high-quality fuel and perform regular fuel system diagnostics. This allows for extending the service life of components and reducing the risk of pressure drops or disturbances in injector operation.

Component condition and service application

The offered pump comes from an Audi vehicle and is intended for service applications as a replacement for the factory-installed component. It is suitable both for standard replacement of a worn pump and for fuel system repairs related to pressure problems or unstable engine operation. The selection of the correct high-pressure pump for a specific vehicle configuration should always be confirmed based on catalog data or part numbers, which minimizes the risk of installation incompatibility. If you are planning a comprehensive repair or upgrade of the engine fuel system area in your Audi and need other components from the same group, such as additional pumps, fuel lines, or pressure control elements, check the available parts in the Audi High Pressure Fuel Pumps category. For further knowledge on diagnostics and operation of the fuel system, it is worth reading the article describing the construction and servicing of injectors, pumps, and the fuel tank – practical tips, tables, and answers to the most frequently asked questions can be found in the material Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.