Mercury 25 EFI FourStroke User Manual page 94

Without sufficient cooling water, the engine, the water pump,
and other components will overheat and suffer damage.
Provide a sufficient supply of water to the water inlets during
operation.
NOTE: If the outboard has run out of fuel, or has been in storage
for an extended period of time, additional attempts to start the
engine will be required to purge the fuel system of air.
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.
IMPORTANT: To prevent engine flooding, do not squeeze the
primer bulb after the engine has warmed up.
3. Set the lanyard stop switch to "RUN" position. Refer to
General Information ‑ Lanyard Stop Switch.
OPERATION
NOTICE
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27348
19791
84
eng