Audi A3 8V High Pressure Fuel Pump 1.4 TFSI Petrol CMBA 04E127026G

Audi A3 8V High Pressure Fuel Pump 1.4 TFSI Petrol CMBA is an original fuel system component designed for 1.4 TFSI petrol engines. This used high-pressure pump from this series ensures stable fuel pressure on the fuel rail, which translates into proper engine operation and predictable performance. This is a particularly beneficial solution for professional fuel system repairs in an Audi A3 8V with a CMBA engine.

Specifications and technical data

• SKU: 04E127026G
• Mark: Audi
• Condition: Used
• OEM Part Number: 04E127026G
• Substitutable numbers: 04E127026G, 04E 127 026 G
• Fuel type: Petrol
• Category: Fuel Pumps & Sending Units

Purpose and role in the fuel system

The high-pressure pump in a 1.4 TFSI engine is responsible for increasing petrol pressure from the level generated by the low-pressure pump to the values required by precise direct injectors. This component operates mechanically via the engine drive, and its efficiency has a direct impact on:

• fuel pressure stability across the entire load range,
• correct fuel dosing by the injectors,
• the refinement of the TFSI unit at idle and under load,
• throttle response and fuel consumption. For TFSI petrol engines, the correct selection of a high-pressure pump is crucial to avoid issues with starting, jerking, or power loss.

Benefits of using an original Audi pump

Using an original high-pressure pump from the Audi group in the A3 8V model allows for maintaining the factory fuel system operating parameters. In practice, this means:

• precise fitment for the 1.4 TFSI CMBA engine in terms of pressure characteristics,
• compatibility with the factory engine control unit and injection maps,
• no need for modifications to the fuel or electrical installation,
• maintaining predictable operating conditions for injectors and pressure sensors. The original pump from the Fuel pumps and level sensors category is the preferred solution in professional workshops, where parameter repeatability and compliance with manufacturer documentation are essential.

Technical characteristics and fuel

The presented pump has been designed to work with petrol fuel, in accordance with the requirements of TFSI engines used in the Audi A3 8V. The high-pressure design allows for generating the appropriately high operating pressure necessary for direct petrol injection into the combustion chamber. Proper selection of the pump for a specific petrol engine helps reduce the risk of:

• excessive load on the mechanical pump drive components,
• improper operation of the pressure regulator,
• engine control unit errors related to fuel pressure deviations. As a result, the fuel system maintains stable parameters, and the engine operates under the conditions intended by the manufacturer.

Application in service and diagnostics

The high-pressure pump in the Audi A3 8V is one of the key components to consider when diagnosing fuel system issues. Symptoms such as difficulty starting when warm, power loss, or fuel pressure errors in the control unit memory are often associated with the need to verify this component. When replacing the pump, it is recommended to:

• check the condition of the low-pressure system (filter, lines, electrical supply),
• verify the tightness of the high-pressure lines,
• monitor real-time pressure parameters using a diagnostic tester. To better understand the principles of the fuel system operation and to properly select components by OEM numbers, it is worth using our guide: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

Complementary fuel system components

If you are planning a comprehensive repair or upgrade of the fuel system area in your Audi and need other components from the same group, such as low-pressure pumps, supply modules, or fuel level sensors, check out the available parts in the Audi fuel pumps and level sensors category.

Summary

Audi A3 8V High Pressure Fuel Pump 1.4 TFSI Petrol CMBA is a practical choice for repairing the fuel system in a TFSI petrol engine. The original design ensures compliance with factory parameters, and the use of a dedicated high-pressure pump helps restore proper engine operation without the need for installation modifications. This is a solution that works well both in a professional service environment and for informed, technically justified replacements in a workshop setting.