The fuel supply scheme used to model the system proposed by the authors is presented, the engine chosen, with the technical characteristics, the type of injection system adopted, the basic principle of electronic gasoline injection, the calculation cycle proposed for gasoline injection. Based on an own model, the authors realized an analytical calculation of the in diagram. The indicated diagram was also raised on an experimental stand in p-V coordinates. Using the equations from the characteristic points, the state parameters in the characteristic points of the engine cycle will be calculated. The diagram for the analytical calculation of the pressure in the intake manifold and of the intake pressure is presented; the variation of these parameters is represented depending on the speed and the ambient temperature. The logic diagram for the analytical calculation, determining the engine parameters are presented. The data obtained by calculations are compared with those obtained by measurements, and the results obtained show that the errors obtained are almost insignificant.