1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Manual, P/N 787024, Page 63Get this manual
The remote oil tank feed and return hoses attach to tubes at the starboard front of the lower motor coverThe 14 in(6,35 mm) line is oil feedthe 5 16 in(7,94 mm) line is oil returnOil is drawn from the tank by the crankcase pulse-driven oil pumpA hose connects the pump to the oil injectorThe injector is ECU-driven, and supplies oil pulses at approximately 40 PSI (276 kPa) to the oil distribution manifoldInjector operation and oil output are variable as determined by the ECU, depending upon throttle position and engine RPMWhen the ECU completes ground connection, the oil injector operatesIt ceases when the ECU ground is brokenThe ECU can detect an injector open circuit, and in such cases will store service code, turn on the System Check "NO OIL" light, and initiate S.L.OWThe oil distribution manifold controls oil supply to the crankcase via four (or six) equal length hoses to the intake manifoldsThe hoses connect to metered orifices that discharge oil immediately behind each throttle plateAnother hose supplies small amount of oil, through check valve, to fuel in the lift pumpThis fueloil mixture helps keep the injector poppet valves free of combustion depositsEach distribution manifold outlet is controlled by check valve hat prevents oil drainback when the injector is inactiveApproximately 6-20 PSI (41-138 kPa) pressure is maintained throughout the system by regulator located in the hose returning to the boat's oil tankTo ensure powerhead longevity, the ECU provides special oiling modesDuring break-in, oil supply below 2000 RPM is at normal programmed ratio; above 2000 RPM, oil supply is doubled, up to maximum 50: ratio, for the first five hours of operationAfter break-in, the oil supply mode is the normal programmed ratio, regardless of RPM INotel