Abstract: A gear pump having a housing with an inlet and an outlet. First and second gears are provided with meshing gear teeth. The gears are ceramic rotor gears which are journaled within the housing. A drive shaft drives the first gear in order to move it relative to the second gear, such as to pump a fluid from the inlet to the outlet of the housing. The housing includes an opening for the passage of the drive shaft and a seal surrounding the opening. The seal includes a first seal part rotating with the first gear, and a second seal part forming part of the housing. The first and second seal parts have facing sealing surfaces, are made of ceramic material and are loaded towards each other by a biasing member parallel to the drive shaft. In this way, a mechanical seal is created between the gear and the housing obviating the need for a seal between the drive shaft and the housing.