2003 Polaris Deep Snow Snowmobiles Service Manual, Page 118Get this manual
ENGINES Oil Pump Bleeding
The oil pump must always be bled following any service to the injector system or engine which allows the loss of oil and subsequent entrapped air during reassembly1Fill oil reservoir with Polaris injector oil2Loosen bleed screwAfter short time oil should flow from beneath the screw head to indicate the pump is free of air3Tighten bleed bleed screw securely