Mercury 250 XS OptiMax Operation, Maintenance & Installation Manual page 98

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
For the initial start of a new engine, or for an engine that ran out of fuel or was
drained of fuel, the fuel system should be filled as follows:
1. Squeeze the fuel line primer bulb until it feels firm.
2. Turn the ignition key switch to the "ON" position for three seconds. This
operates the electric fuel pump.
3. Turn the ignition key switch back to the "OFF" position, and squeeze the
primer bulb again until it feels firm. Turn the ignition key switch to the
"ON" position again for three seconds. 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
88
eng