The paper describes the stand-speed video to determine the length of the jet spray of fuel for different injection pressures, typical for CR systems under atmospheric conditions. Describes the work unit synchronization shooting with opening the valve nozzle. Determination of the length of the sprayed fuel is a specially designed program for two methods of determining the boundaries of the jet: the threshold and the method of "triangle". The experimental results of determining the length of the jet for different injection pressures.