Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 362Get this manual
Oil Injection Components (See Page for Location) (f)
2 PSI CHECK VALVE This valve prevents gasoline from being forced into the oil lines LOW OIL (FLOAT) SENSOR If oil level drops in oil reservoir, the sensor witt signal the warning module to sound the warning horn
CD REMOTE OIL TANK
Holds gallons of oil
The tank is pressurized by air from crankcase pressure thus forcing oil up the outlet hose to the oil reservoir on engine
CD OIL PICK UP TUBE
A filter screen is located in end of tube to prevent dirt or other particles from entering the system
ELECTRONIC CONTROL UNIT The Electronic Control Unit (ECU) continuously monitors the oil reservoir oil level The ECU activates the warning horn when signaled by the low oil sensor