1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Manual, P/N 787024, Page 62Get this manual
Oil injector operation is variable and controlled by the ECUIts operation is relative to throttle position and engine RPM, and is designed to function with any TC-W3 oilThe 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.OWA fuse in the Power Distribution Panel (position 1) protects the oil injector circuit Pressure Regulator
The pressure regulator is located in the oil return lineThe regulator maintains approximately 6-20 PSI (41 -138 kPa), and allows oil to return to the boat's oil tank
Oil Distribution Manifold
[] The distribution manifold receives oil under pressure from the oil injectorIt has metered outlets and hoses, each controlled by check valve to reduce oil drainback when the injector is inactiveFour (or six) hoses supply oil to the incoming air stream at the intake manifoldsThey're of equal length to ensure volume consistencyOne hose supplies oil, through check valve, to the fuel lift pumpThis reduces carbon buildup on the fuel injector poppet valves