A method for detecting a leak in a liquid system, the liquid system comprising a tank for storage of a liquid solution, an injector, a feed line arranged between the tank and the injector, a pressurizing means for allowing the liquid solution to flow in the feed line from the tank to the injector, a pressure sensor arranged to measure a pressure in the feed line, the method comprising the following steps e) Operating the injector to generate a controlled injector liquid flow rate, f) Operating the pressurizing means for allowing the liquid solution to flow in the feed line from the tank to the injector, g) Monitoring the pressure of the liquid in the feed line and/or monitoring the feed line input liquid flow rate, h) Detecting an abnormal operating condition when the feed line input liquid flow rate increases above a predetermined feed line liquid flow rate threshold (Th1) for a given feed line pressure and a given controlled injector liquid flowrate, and/or when the monitored feed line pressure decreases below a predetermined feed line pressure threshold (Th2) for a given feed line input liquid flow rate and a given controlled injector liquid flow rate i) When the abnormal condition is detected, the method comprises the further steps of a) Operating the injector in order to prevent liquid from exiting the feed line, b) Depressurizing the feed line, c) Monitoring pressure measured by the pressure sensor subsequent to the depressurizing of the feed line, d) Determining the presence of a leak in the system by detecting whether the monitored pressure deviates from a predetermined pressure value over a predetermined time period or deviates from a predetermined pressure evolution based on at least one measurement. e) Operating the injector to generate a controlled injector liquid flow rate, f) Operating the pressurizing means for allowing the liquid solution to flow in the feed line from the tank to the injector, g) Monitoring the pressure of the liquid in the feed line and/or monitoring the feed line input liquid flow rate, h) Detecting an abnormal operating condition when the feed line input liquid flow rate increases above a predetermined feed line liquid flow rate threshold (Th1) for a given feed line pressure and a given controlled injector liquid flowrate, and/or when the monitored feed line pressure decreases below a predetermined feed line pressure threshold (Th2) for a given feed line input liquid flow rate and a given controlled injector liquid flow rate i) When the abnormal condition is detected, the method comprises the further steps of a) Operating the injector in order to prevent liquid from exiting the feed line, b) Depressurizing the feed line, c) Monitoring pressure measured by the pressure sensor subsequent to the depressurizing of the feed line, d) Determining the presence of a leak in the system by detecting whether the monitored pressure deviates from a predetermined pressure value over a predetermined time period or deviates from a predetermined pressure evolution based on at least one measurement. a) Operating the injector in order to prevent liquid from exiting the feed line, b) Depressurizing the feed line, c) Monitoring pressure measured by the pressure sensor subsequent to the depressurizing of the feed line, d) Determining the presence of a leak in the system by detecting whether the monitored pressure deviates from a predetermined pressure value over a predetermined time period or deviates from a predetermined pressure evolution based on at least one measurement. <EOS>