A pressure filling system for filling aerosol cans with liquid includes an enclosure including a top wall, a bottom wall, and side walls which form a filling chamber. An air operated pump is positioned within the filling chamber. A liquid supply tube extends into the chamber and into the pump. A pressurized air supply tube extends into the chamber and into the pump. A pressurized supply outlet tube which extends from the pump to a filling head in the filling chamber. An air purge tube is connected to the filling head to purge excess air from the liquid. A lifting mechanism lifts an aerosol can into engagement with the filling head for receiving pressurized liquid.