end 18 of the housing 10 so as to connect the outlet to the kidney shaped opening 88 for flow communication thereto when the gerotor pump 90 is rotated the meshing and demeshing of the teeth causes the fluid to be pumped to be drawn into the volume between the male rotor gear 92 and the female gear member 94 the inlet port 2 thus provides an inlet fluid passage which is connected by suitable conduit means to the fluid to be pumped not shown the outlet port 6 is connected by suitable conduit means to a receiver not shown which receives the pressurized fluid from the pump 100 a one way fluid flow device 8 such as a conventional check valve is provided to insure one way fluid flow from the gerotor pump through the outlet port 6 and also to prevent bleed down when the pump 100 is deactivated the efficiency of any positive displacement pump such as herein described depends on the axial clearances of the members in order to insure minimum axial clearance between the three cooperating gerotor pump members 92 94 and 96 respectively the inlet member 89 is biased towards the gerotor pump as shown in fig5 for this purpose a pair of spaced apart cavities 72 are formed in the inlet member 89 adjacent to the opposite end 18 of the housing 10 in each cavity 72 is placed a resilient or biasing member 68 which in the preferred embodiment is a spring biasing member such as.