Mercury 225 EFI Service Manual page 296

OIL INJECTION
Oil Injection Components
REMOTE OIL TANK
Holds 3 gallons (11.5 liters) of oil.
NOTE: Some boats may be equipped with optional 1.8 gallon (7.0 liters) oil tank.
The tank is pressurized by air from crankcase pressure thus forcing oil up the outlet hose
to the oil reservoir on engine.
OIL PICK UP TUBE
A filter screen is located in end of tube to prevent dirt or other particles from entering the
system.
c
FILTER
Directional filter designed to prevent impurities from entering oil reservoir.
4 PSI CHECK VALVE
If oil flow to reservoir is obstructed and injection pump continues to pump oil, the 4 PSI
valve will open to allow air to enter reservoir to prevent a vacuum.
e
OIL RESERVOIR
The oil reservoir feeds the oil pump and contains enough oil for 20–25 minutes of full
throttle running after the remote tank is empty. The warning horn will sound if the oil level
in oil reservoir is low.
LOW OIL (FLOAT) SENSOR
If oil level drops in oil reservoir, the sensor will signal the Electronic Control Module (ECM)
to sound the warning horn.
VAPOR SEPARATOR TANK (VST)
Contains electric fuel pump which pumps fuel @ 43 psi
the fuel rail. Oil supplied by the electric oil pump is mixed with fuel supplied by the engine
pulse pump in the VST.
h
OIL INLET HOSE
Hose that carries oil from oil reservoir to electric oil pump.
OIL INJECTION PUMP
Injection pump is electrically operated and controlled by the ECM. Pump varies oil ratio
from 120:1 at idle to 50:1 at wide open throttle.
OIL OUTLET HOSE
Hose that carries oil from electric fuel pump to mix with fuel in vapor separator.
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2 psi (296.5 kPa 13.8 kPa) to
90-884294 OCTOBER 2001