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Combustion process in diesel engine is largely dependent on way of formation of the air-fuel mixture which ignites spontaneously. Fuel-air mixture is formed in the gas phase, so the fuel evaporation time is an important parameter of the combustion process. Time of fuel evaporation depends on temperature and pressure in space where fuel exist as well as area of evaporation. So, the size and amount of fuel droplets determine the range and speed of the initial stream in the injection process. The problem of formation and evaporation of the droplets is widely described in the literature and show the analysis of this issue as very complicated and time-consuming. Incorrect assessments of the boundary conditions could lead to unauthorized inference. Therefore, the authors undertook to introduce an optical method - estimation of fuel properties on the basis of recorded images via analysis of the fuel stream flowing from the injector. Researchers emphasizes that the definition of the correlation between such a relatively simple and rapid visualization studies and research motor would significantly reduce the cost of design and tests. Constructed chamber in which the original fuel injector was placed and subsequent phases of the injection were recorded by the camera. The study used three types of fuel: diesel fuel with a low sulphur content ONM S50, rape methyl ester oil EMKOR of FAME and pure canola virgin oil. The results confirmed the hypothesis about the possibility of using a relatively simple method to assess the quality and quantity of fuel stream. It makes possible to use recorded images in designing process of injector or during engine tests.