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The article is devoted to solving the problem, associated with the partial replacement of commercial mineral diesel fuel (DT) with mixed vegetable-mineral (DST) motor fuel. DST biocomponent is a vegetable oil, for example, camelina oil. A constructive version of a dual-fuel diesel power supply system is proposed, the main element of which is a mixer-dispenser of vegetable oil and mineral diesel fuel, which, due to the electrodosers controlled by the electronic control unit (ECU), is used according to the signals of the load-speed diesel engine sensors (crankshaft rotational speed, position rail of the high pressure fuel pump) and the camelina oil temperature sensor, to ensure the supply of diesel mixed fuel with different contents components. Under the supervision were tractors of one year of production, with approximately the same operating time and carrying out the same production work at the livestock complex of the enterprise. The estimated parameters of wear of the plunger pairs of the pump sections of the injection pump are: the geometric dimensions of the details of the plunger pairs (ovality and taper of the plunger, diameters of the plunger and sleeve, annular gap between the plunger and the sleeve); mass of parts of plunger pairs (plunger, sleeve); volumetric cyclic fuel supply, hydraulic density of plunger pairs. The use of diesel mixed fuel based on vegetable oil, containing for example 50% mineral marketable fuel and 50% camelina oil, allows a slight decrease in effective power (not more than 6%) and a slight increase in the specific effective consumption of mixed fuel (up to 14%) % of fuel of petroleum origin, as well as reduce exhaust smoke by 17-20% and reduce the content of carbon monoxide by 35-40% compared with the operation of diesel on commercial mineral diesel fuel.