Fig. 59 •
Secondary
Fuel
Filter
Fig. 60 -
Bleeding
the
Fuel
System
1. Injector Connector
FUEL FIL
TEA
PUMP
After 120 hours of operation, remove the cover from the
fuel lift pump and clean the filter (Fig. 61, item 7)
BLEEDING THE
FUEL
SYSTEM
When air is allowed to enter the fuel system by running
the fuel tank completely dry, draining the fuel filters,
changing the fuel filters,
or
a loose connection, the fuel
system must be bled. To properly bleed the fuel sys-
tem, use the following procedure:
36
1.
Open the fuel shut off valve on the tank and loosen
the air vent plug
on
the primary fuel filter ( 1). Stroke
the hand lever
on
the fuel lift pump (6) until the fuel
flows out of the vent, free of trapped air pockets.
Tighten the vent plugs.
If the cam that operates the lift pump
is
on the high
spot, the lift pump will not pump by stroking the
hand lever. To correct this, rotate the engine 1/2 a
turn, using the starter.
2.
Loosen the vent plug on the top of the secondary
fuel filter (5), and stroke the lift pump lever until the
fuel flows out of the vent, free of trapped air.
Tighten the vent plug.
3.
Loosen the lower vent plug (2) on the injection
pump, and stroke the lift pump lever until fuel flows
out the vent; again, free of air. Tighten the vent
plug. Loosen the
upper
vent plug (item
8,
on the
back of the injection pump) only
by
two turns.
4.
Loosen the injector lines at the injectors (Ref. Fig.
60). Crank the engine with the starter motor until
the fuel flows free without any pockets of air at each
connection.
NOTE: The fuel shut off knob must be pushed in for
the fuel to flow.
NOTE: Avoid overheating the starter motor. Allow
the motor to cool for 2 minutes after each 30
seconds of operation.
5. Tighten the injector connections. Leave the upper
vent plug open
by
two turns. Start the engine.
As
soon as the fuel flows free of all air pockets, tighten
the upper vent plug.
Diagram 59 on the following page shows the items
used in bleeding the fuel system. Whenever a filter and/
or other items are changed the steps listed above
should always be followed as they will help make the
task of bleeding the fuel system much easier.
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