1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 66Get this manual
VRO Component Servicing
Any time the VRO oil supply line has been disconnected, you must run 50: fuelloil mixture in the fuel tank until oil pump delivery is verifiedOnce oil delivery has been confirmed, use clear fuel in the tankVRO Pickup Assembly and Oil Supply Hose Servicing
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 Torx screws and lift 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 rods2With the pickup assembly out of the reservoir, vacuum test the system to check for air leaks Carefully remove the oil hose from pickup assembly and from outboard oil inlet fitting