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Small combustion Engines equipped with a conventional carburetor system have the disadvantage of incomplete combustion in different load ranges because of a sub optimal air fuel ratio. The results are harmful exhausts, high fuel consumption and a low degree of efficiency. Based on this problem VEMAC has invented the patented Piezoelectric Controlled Carburetor (PCC). A small piezo bending actuator in front of the fuel jet allows controlling the fuel flow through the jet according to the desired air-fuel-ratio (AFR) and the engine performance. To control the piezo bending actuator and process the data of the incoming sensor signals an engine control unit (ECU), with modular software architecture for different applications was developed. This paper describes the working principle of the PCC technology and presents the most up-to-date development and test results.