A method for carrying out a pressure and leak testing

The invention relates to a method for carrying out a pressure and leak testing before a filling of a storage tank (5) with a pressurized gaseous medium, in particular hydrogen, in which a gas buffer memory (1), in which the medium to be used for filling is stored , via a first valve (28) having a a piping volume limiting pipe section (29) is connected, which is connected via a second valve (31) and a subsequent tank feed line (34) to the storage container (5), open prior to filling in first (28) and a closed second valve (31) depresses the pipe volume to a predefined initial pressure with medium or hydrogen from the gas buffer memory (1) then the first valve (28) closed and the second valve (31) is opened so that only befindliches in the pipeline volume of medium or hydrogen impresses a tank valve (53) of the storage container (5) and flows into the storage tank (5).