TP-5606 6/02 Scheduled Maintenance 3-7
Bleeding the Fuel System
If the generator set engine runs out of fuel, air leaks
develop in the suction side of the fuel system, or the fuel
filter is replaced, it will be necessary to bleed the entire
system to prevent starting failures and/or erratic
operation. See Figure 3-7 and refer to the following
procedure.
1. Disconnect lead 5 (single phase) or 71A (three
phase) from the starter relay to disable cranking
during the bleeding procedure.
2. Fill the fuel tank.
3. Loosen the line connection at the fuel filter.
4. Crank the engine until fuel (free from bubbles)
flows from the loosened connection. Tighten the
fuel line connection.
5. Loosen the small vent screw (with Phillips head) on
the fuel filter.
6. Crank the engine until fuel (free from bubbles),
flows from this point. Tighten 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 from bubbles) flows from this loosened
connection. Tighten line connection.
9. Reconnect lead 5 or 71A to the starter relay.
WARNING
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling, storing, and
using fuels.
Draining the fuel system. Explosive fuel vapors can
cause severe injury or death. Spilled fuel can cause an
explosion. Use a container to catch fuel when draining the fuel
system. Wipe up spilled fuel after draining the system.
1-933
1
2
3
4
5
1. Line Connection (Bleed
Point)
2. Vent Screw
3. Line Connection (Bleed
Point)
4. Fuel Injection Pump
5. Electric Fuel Pump
6. Fuel Filter
6
Figure 3-7. Bleeding the Fuel System
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