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The two-stroke SI-engine is the preferred drive for handheld power tools because of its high power density. Advantages of the two-stroke concept are its excellent reliability and the simple mechanical construction, which results in a good price-performance ratio. Usually these engines are equipped with carburators to meter the fuel. The tuning of carburetors is complex and compromises between idle, part load and full load settings are necessary. This article describes the development of an electronically controlled fuel injection system for hand-held power tools that allows optimum performance in all operation points and an automatic engine adjustment for different ambient conditions and fuel qualities. The main requirements were a good reliability under adverse conditions (such as dirt, wet conditions and vibrations), low weight and a maintenance free system. Therefore, each component of the injection system was especially designed for the use in handheld power tools.