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New exploitation technologies, discovery of new resources, political instabilities and the urge of countries for independence in the field of energy resources secures the future of the gas-energy market. These factors may even lead to the "gas-age" as forecasted by several groups. At least in the U.S. the actual development of prices indicate, that gas is getting more and more attractive in comparison to crude oil. The development of worldwide available resources of natural gas adumbrate, that the worldwide development goes into a similar direction. Natural gas operated reciprocal engines therefore will play an increasing role in the general mix of energy conversion units. Low emissions of gas operated engines support this trend. Dual-fuel engines, which are able to handle both, liquid Diesel fuel and gaseous fuel play a special role in the introduction of gas combustion technologies. Due to their flexibility they will keep a strong position even when gas technology is introduced to a further extend. While gas-operated stationary engines have some tradition and are mainly operated with low pressure gas, actual prices for natural gas are so attractive, that even mobile applications with transient operated middle- or high-speed engines request more and more for gas- or dual-fuel-engines which are able to be operated with LNG or CNG. This paper will give an overview on actual existing systems with focus on fuel injection equipment. As a consequence to main backdrafts of these systems for dual fuel engines and due to recent progress in the development of CR(Compressed Natural Gas)-injectors a new promising approach for an injection system in Dual-fuel engines will be discussed.