Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 200Get this manual
Electric Oil Pump Test (1997 Models Only) NOTE: 1998 Model oil pumps do not activate warning if there is an oil pump malfunction or if there are air bubbles in the oil supply hoseThe oil warning system on 1998 Models will only be activated if the engine mounted oil reservoir is Iowan oil
1If the warning system is activated and indicating no oil flow to the oil pump, the first thing to do is visually check the oil supply hose going to the oil pump for signs of air2If the oil supply hose is not full of oil, purge out the air following instructions in Filling the Oil Injection System3If the oil supply hose is full of oil, this indicates problem inside the electric oil pumpThe electric oil pump is not serviceableReplace the electric oil pump