A filling system for filling containers of vehicles with service fluids on assembly lines in the automotive industry, wherein the filling system has specifically designed filling adapters and a filling system with a block structure, wherein the liquid or gaseous service fluids are supplied with the filling adapters to the respective containers of the vehicle to be specifically filled and wherein multiple of the electronic, electrical, pneumatic and hydraulic assemblies required for a filling process which can be spatially and functionally encapsulated in the filling system are structurally integrated in a common block structure of the filling system, characterized in that the block structure has a hydraulic level, a mounting level, and an electronics level, which are each manufactured as a separate assembly and are assembled together as a functionally operatively connected common assembly, wherein the hydraulic level has a cuboid base body, in the interior of which the channel structures specifically designed for a respective concrete adaptation are formed for guiding service fluids, in the lower section of which a plurality of first recesses are formed, which are each aligned horizontally and arranged perpendicularly to the longitudinal direction of the base body and in each case are arranged in pairs, vertically, one above the other, wherein each recess has a flow connection to one of the channel structures formed in the interior on its section directed towards the interior of the base body, wherein each recess has an open channel as a flow connection to a block valve on its section directed towards the outside of the base body, wherein the recesses, which are aligned in pairs one above the other, can each be brought into operative connection with a block valve, and wherein further recesses are formed above the first recesses for accommodating actuating elements for the channel structures and block valves, wherein the mounting level has a rectangular base plate, in the lower section of which a plurality of first through openings are formed, which are each aligned horizontally and arranged perpendicularly to the longitudinal direction of the base plate and are each arranged in pairs, vertically, one above the other, and the arrangement and geometric shape of which are congruent with the first recesses formed in the lower section of the cuboid base body of the hydraulic level, wherein a plurality of second through openings are formed above these first through openings, wherein the arrangement and geometric shape of which is congruent with the further recesses formed in the cuboid base body of the hydraulic level above the first recesses, and wherein a plurality of third through openings are formed in the upper section, which in their entirety form a perforated grid, wherein the electronics level has a rectangular base plate, in the base surface of which recesses and through-openings are formed, which are each aligned horizontally and arranged perpendicular to the longitudinal direction of the base plate and in which the actuating elements for the channel structures formed in the hydraulic level and the block valves mounted in the hydraulic level can be supported by means of the mounting level. wherein the hydraulic level has a cuboid base body, in the interior of which the channel structures specifically designed for a respective concrete adaptation are formed for guiding service fluids, in the lower section of which a plurality of first recesses are formed, which are each aligned horizontally and arranged perpendicularly to the longitudinal direction of the base body and in each case are arranged in pairs, vertically, one above the other, wherein each recess has a flow connection to one of the channel structures formed in the interior on its section directed towards the interior of the base body, wherein each recess has an open channel as a flow connection to a block valve on its section directed towards the outside of the base body, wherein the recesses, which are aligned in pairs one above the other, can each be brought into operative connection with a block valve, and wherein further recesses are formed above the first recesses for accommodating actuating elements for the channel structures and block valves, wherein the mounting level has a rectangular base plate, in the lower section of which a plurality of first through openings are formed, which are each aligned horizontally and arranged perpendicularly to the longitudinal direction of the base plate and are each arranged in pairs, vertically, one above the other, and the arrangement and geometric shape of which are congruent with the first recesses formed in the lower section of the cuboid base body of the hydraulic level, wherein a plurality of second through openings are formed above these first through openings, wherein the arrangement and geometric shape of which is congruent with the further recesses formed in the cuboid base body of the hydraulic level above the first recesses, and wherein a plurality of third through openings are formed in the upper section, which in their entirety form a perforated grid, wherein the electronics level has a rectangular base plate, in the base surface of which recesses and through-openings are formed, which are each aligned horizontally and arranged perpendicular to the longitudinal direction of the base plate and in which the actuating elements for the channel structures formed in the hydraulic level and the block valves mounted in the hydraulic level can be supported by means of the mounting level.