Provided is a supply system for an inkjet printer (2) comprising a plurality of ejection nozzles (4); the supply system (1) comprises a supply element (5), which is adapted to contain ink and to whichthe ejection nozzles (4) are fluidically connected; a collection manifold (7), which is fluidically connected to the nozzles (4) and to the supply element; a suction assembly (9) for reducing the pressure inside the supply element (5); and a conveying device (12), in particular a pump, which is adapted to push the ink from the collection manifold (7) through the supply element (5).