Mercury 150 Operation, Maintenance And Installation Manual page 111

OUTBOARD INSTALLATION
3. If the oil level is less than 118 ml (4 oz), loosen the vent cap. Use a squirt
can and fill the tank with at least 118 ml (4 oz) of the recommended oil.
Tighten the vent cap.
b
PRIMING THE OIL INJECTION PUMP
Before starting the engine for the first time, prime the oil injection pump.
Priming will remove any air that may be in the pump, oil supply hose, or internal
passages.
a
a - Oil injection pump
b - Oil supply hose
IMPORTANT: Fill the engine fuel system with fuel before priming the oil
injection pump. Otherwise, the fuel pump will run without fuel during the priming
process and may be damaged.
Prime the oil injection pump as follows:
1. Fill the engine fuel tank with fuel.
eng
a - Engine‑mounted oil reservoir tank
b - Vent cap
a
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b
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