Mercury 300 XS OptiMax Manual page 68

STARTING PROCEDURE
1. Lower the outboard to the "RUN" position. Make sure all the cooling water
intake holes are submerged.
2. Open fuel tank filler cap vent screw (manual venting fuel tanks).
3. Squeeze the fuel line primer bulb several times until it feels firm.
4. Set the lanyard stop switch to the "RUN" position. Read the Lanyard Stop
Switch safety explanation and warning in the General Information
section.
OPERATION
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