Mercury 150 Operation, Maintenance And Installation Manual page 86

The fuel demand valve has a manual release. The manual release can be used
(pushed in) to open (bypass) the valve in case of a fuel blockage in the valve.
a
FUEL TANKS
Portable Fuel Tank
Select a suitable location in the boat within the engine fuel line length
limitations and secure the tank in place.
Permanent Fuel Tank
Permanent fuel tanks should be installed in accordance with industry and
federal safety standards, which include recommendations applicable to
grounding, antisiphon protection, ventilation, etc.
FILLING THE FUEL SYSTEM
When starting an engine for the first time, or starting an engine that ran out of
fuel or was drained of fuel, fill and prime the fuel system.
To fill and prime the fuel system:
1. Squeeze the fuel line primer bulb until it feels firm.
2. Turn the key switch to the "ON" position for three seconds. This operates
the electric fuel pump.
3. Turn the key switch back to the "OFF" position and squeeze the primer
bulb again until it feels firm.
4. Turn the key switch to the "ON" position again for three seconds.
5. Continue this procedure until the fuel line primer bulb stays firm.
OUTBOARD INSTALLATION
b
c
46273
a - Fuel demand valve ‑ installed in the
fuel hose between the fuel tank and
primer bulb
b - Manual release
c - Vent/water drain holes
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