Mercury 40 JET FOURSTROKE Operation, Maintenance & Installation Manual page 47

Failure to provide sufficient cooling water will damage the water pump and
cause the engine to overheat. Never start or operate the engine without the
intake housing in the water.
1. Open fuel tank vent screw (in filler cap) on manual venting type fuel tanks.
2. Position the fuel line primer bulb so the arrow on the side of the bulb is
pointing up. Squeeze the fuel line primer bulb several times until it feels
firm.
3. Set the lanyard stop switch to "RUN" position. Refer to General
Information ‑ Lanyard Stop Switch.
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OPERATION
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