Evinrude 4906B 4HP 1969 Owner's Manual page 100

Next, drill the appropriate
suitable fitting to pickup the cylinder vacu-
um. Install the cover plate with the
in place. Mount the fuel pump in a conven-
ient location, and then connect the vacuum
hose. Plug the hole in the intake manifold
just below the carburetor.
lar fuel tank. Because the new system will
only have one hose, a new quick-disconnect
fi tting must also be purchased and and con-
nected to the engine.
TROUBLESHOOTING
Observe the stamped
pressure-type fuel tank adjacent
fi tting; one for air and the other for fuel.
Also, observe the rib on one hose running
the full length from the tank to the engine.
This rib will help to identify the same hose
at the tank and the engine.
With the fuel tank fill cap securely clos-
ed, insert a screwdriver
quick-disconnect at the engine to hold the
check valve open.
pump on the fuel tank and fuel should squirt
out the quick-disconnect
dr iver is holding the check valve open.
If fuel is not present at the fitting, the
pressure fuel tank primer pump or the check
valve in the fuel pickup at the bottom of the
fuel tank may be defective.
If the engine runs for short periods and
then shuts down from
problem may be lack of air pressure in the
tank. To check for air pressure,
engine has run for just a short period, open
the fill cap very slightly.
Pressure-type fuel tank with the fuel line (left),
air line (right), connected.
hose which extends the full length to the engine.
size hole for a
tting
fi
Purchase a regu-
markings on the
to each
into the fuel line
Now, work the primer
because the screw-
lack of fuel, the
after the
A hissing sound
and
Notice the rib on the fuel
TROUBLESHOOTING
of
Back side the double fuel/air
photograph, the air line is on the left
the right.
indicating escaping
Lack of air may be caused by defective
rings at the connectors,
check valve in the intake manifold is not
properly seated.
Integral Fuel Tank System
On small engines equipped with an inte-
gral fuel tank above the flywheel, or else-
where on the engine, the filter in the tank
may be plugged. To check the fuel flow,
disconnect the fuel line at the carburetor
and fuel should flow from the line if the
shut-off valve is open.
ent, the usual cause is a plugged filter in the
fuel tank. It is very difficult to determine
if a porcelain-type
general appearance
factory may be a false indication.
fore, if the filter
Pressure-type fuel tank with the air and fuel lines
attached through a double connector.
be tightly closed for the system
connector. In this
and the fuel on
air should be heard.
or because the
If fuel is not pres-
fil ter is plugged. The
that the filter is satis-
There-
is suspected, the best
The fill cap must
to
operate properly.
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