TP-5964 7/01 11Section 3 Scheduled Maintenance
3.4.3 Fuel System Bleeding
Bleed air from the fuel system to prevent starting failures
and/or erratic operation. One or more of the following
causes air to collect in fuel system:
D Operating the generator set until the fuel supply is
emptied.
D Developing air leaks in the suction side of the fuel
system.
D Replacing the fuel filter.
Fuel System Bleed Procedure for Generator Sets
without a Fuel Prime Switch
1. Disconnect lead 71A from the starter relay to
disable cranking during the bleed procedure.
2. Fill the fuel tank.
3. Loosen the line connection at the fuel filter. See
Figure 3-5.
4. Crank the engine until fuel, free of bubbles, flows
from the loosened connection. Tighten the fuel line
connection.
5. Loosen the small vent screw on the fuel filter.
6. Crank the engine until fuel, free of bubbles, flows
from this point. Tighten the vent screw.
7. Loosen the line connection (bleed point) at the
fuel-injection pump inlet.
8. Crank the engine to operate the fuel pump until
fuel, free of bubbles, flows from this loosened
connection. Tighten the line connection.
9. Reconnect lead 71A to the starter relay.
Note: Wipe up all spilled diesel fuel after bleeding
the system. Wash hands after any contact
with fuel oil.
Fuel System Bleed Procedure for Generator Sets
with a Fuel Prime Switch
1. Fill the fuel tank.
2. Toggle the fuel prime switch for several seconds to
remove air from the fuel line. See Figure 3-6.
3. Start the generator set.
1
2
543
ADV-6346-
1
1. Line connection (bleed point)
2. Fuel injection pump
3. Electric fuel pump
4. Vent screw
5. Fuel filter
Figure 3-5 Fuel System
ADV-6346-D
1. Fuel priming switch
1
Figure 3-6 Fuel Prime Switch
3.5 Air Cleaner
3.5.1 Air Cleaner Service
At the interval specified in the service schedule, clean or
replace the air cleaner’s paper element. Clean the
element more frequently if the generator set operates in
dirty, dusty conditions. Follow the procedure described
on the next page. At the time of service, clean the air
cleaner breather pipe and remove all dust and foreign
matter from the air cleaner housing.
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