The present paper describes available operational sources to control the instantaneous fuel flow rate driven by injection system at the high frequencies, 25 and 50 Hz, with main focus to the fast transient phases. The influence of outflow nozzle diameter ranged from 100 to 500 μm on the pipe flow dynamics has been investigated. It was experimentally observed that instantaneous flow rate can be actively controlled by varying operation injection frequency and injection time within a cycling period. Aiming at the practical fuel injection control by using a pressure measurement the analysis of those data is introduced. Results of the PDA measurements in high pressure rig to validate a fuel spray formation in advanced direct injection system is also presented.