The aim of the research was to determine the impact of biofuels from wast e materials of plant and animal origin on the parameters of the common rail power supply system in the utility engine. The tests included identification of power system operation parameters in the whole load range of the tested engine, taking into account the limit and diagnostic parameters of the injectors operation. Then,for certain parameters, the engine injectors were tested on the test ench: injection pressure in the range of 25-135 MPa, injectiontime in the range of 200-1600 μs. In the tests, as reference fuel for testing injectors were used diesel fuel and three types of methyl esters of higher fatty acids: vegetable, animal and WCO origin. The measurements for individual fuels were made in the operating temperat ure range 30-60°C. The tests have shown significant changes in the volume of the fuel injection rates de pending on the fuel used. Particularly, visible changes concerned the power system operation parameters for high engine speeds and the maximum working pressure of the common rail system in the engine. (PDF) The impact of selected biofuels on the performance parameters of the Common Rail power system in the utility engine. Available from: https://www.researchgate.net/publication 9096496_The_impact_of_selected_biofuels_on_the_performance_parameters_of_the_Common_Rail_power_system_in_the_utility_engine [accessed Dec 12 2018].