Mercury 3.0 Liter Service Manual download pdf (Page 94)

90-898303

4-9

Oil Injection Components

REMOTE OIL TANK (A)

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 (B)

A filter screen is located in end of tube to prevent dirt or other particles from

entering the system.

FILTER (C)

Directional filter designed to prevent impurities from entering oil reservoir.

4 PSI CHECK VALVE (D)

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.

OIL RESERVOIR (E)

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 (F)

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) (G)

Contains electric fuel pump which pumps fuel @ 43 psi ± 2 psi (296.5 kPa

±13.8 kPa) to the fuel rail. Oil supplied by the electric oil pump is mixed with

fuel supplied by the engine pulse pump in the VST.

OIL INLET HOSE (H)

Hose that carries oil from oil reservoir to electric oil pump.

OIL INJECTION PUMP(I)

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 (J)

Hose that carries oil from electric fuel pump to mix with fuel in vapor

separator.

Notes

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Mercury 3.0 Liter Service Manual Page 94