1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 71Get this manual
VRO& Component Servicing Any time that the VRO oil supply line has been disconnected from the engine, you must run 100:1 fueloil mixture in the fuel tank for period of time sufficient to verify oil consumptionOnce oil consumption has been verified, you can switch back to clear fuel in the tankOil Supply Hose and Pickup Assembly If you suspect that the oil supply to the VRO$ pump is being restricted, check two areas1Remove the pickup assembly and inspect for clogged or contaminated filter Remove the four No25 Torx screws and remove the pickup assembly from the reservoir Carefully remove the pickup filter and flush with mild solvent to remove any contamination Install the filter, being careful not to move the pickup assembly on its support rods12306