Method of priming inkjet printhead

A method of priming an inkjet printhead, the inkjet printhead having a plurality of ink ejection nozzles, the method comprising the steps of:

• providing an ink bag containing ink for distribution to the nozzles via a fluid path between the ink bag and the nozzles;
• applying inwardly directed force on at least one exterior wall of the ink bag so as to reduce an available fluid volume of the ink bag, thereby causing ink to flow from the ink bag to the nozzles along the fluid path;
• and
• arranging a biasing member in the ink bag so that the biasing member applies outwardly directed force on at least one interior wall of the ink bag so as to restrain the reduction of available fluid volume of the ink bag only once the available fluid volume of the ink bag has been reduced to a predetermined volume,
• wherein the fluid path connects the ink bag to at least 6400 nozzles of the printhead.