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As power consumption globally increases and fossil fuels consumption is scheduled to be reduced, there is a need to look for new fuels for power generation. Renewable fuels are getting more and more attention but the availability is still low and price is high. The worldwide power generation industry turns its eyes towards wastes and the methods for their effective use for power generation. The industrial waste and biowaste can be turned into gas or liquid fuel. The technologies are already well known and in commercial use for many years. The main challenge is low fuel quality comparing to conventional fossil fuels. Thus, their application using conventional technologies is limited mainly to boiler combined with steam turbine. Such solution is, unfortunately, expensive and inefficient. The industrial gas engine can be considered as interesting alternative, but some challenges need to be solved. The standard fuel system of the industrial gas engine is designed and optimized for high quality fuel, such as natural gas or biogas. Moreover, the industrial engines require very precise control of mixture composition, to ensure stable operation at desired load profile. Due to this, the gas fuel system needs to be fast in response and should provide proper cylinder balancing. This paper describes analysis of several modifications to standard fuel system and their operation for low quality fuel. Analysis focuses on gas distribution for each cylinder of the industrial engine and stability of mixture formation. The results and discussion includes also efficiency and emissions optimization.