TP-6071 3/00 11Section 4 Fuel System
Section 4 Fuel System
4.1 General
In most installations, both the generator set and the
propulsion engine operate from a common fuel tank with
a dual dip tube arrangement. The generator set’s dip
tube is shorter than the propulsion engine’s dip tube.
With this arrangement fuel may not be available to the
generator set when the fuel supply is low. See
Figure 4-1 for a fuel system schematic.
Generator
set
Propulsion
engine
1
2
4
3
To fuel
injectors
1. Fuel tank
2. Dual dip tubes
3. Fuel filter
4. Fuel feed pump
607141
Figure 4-1 Fuel System Schematic, Typical
4.2 Fuel Filter
Clean the fuel filter with fresh fuel oil and compressed
air. The filter’s useful life will be determined largely by
the quality and condition of the fuel used. Under normal
conditions, replace the fuel filter element at the specified
interval in the generator set’s operation manual. Use the
following procedure to replace the fuel filter.
Fuel Filter Replacement Procedure:
1. Close the fuel valve.
2. Remove the fuel filter.
3. Clean the contact surface of the fuel oil filter
adapter.
4. Lightly lubricate the gasket surface of the new fuel
filter with fresh fuel oil. Thread the filter on the
adapter until the gasket makes contact; hand
tighten the filter an additional one-half turn.
5. Open the fuel valve.
6. Bleed the fuel system. See Section 4.3.
4.3 Bleeding
If the generator set engine runs out of fuel, if air leaks
develop in the suction side of the fuel system, or if the
fuel filter is replaced, it will be necessary to bleed the
entire system to prevent starting failures and/or erratic
operation.
Note: The bleeding procedure requires the battery to be
connected so that engine cranking will occur. Do
not allow the engine/generator to start. To
prevent engine starting, disconnect line 71A from
the starter motor solenoid (spade terminal).
Fuel System Bleeding Procedure:
1. Loosen vent screw A at the fuel filter. See
Figure 4-2.
2. Toggle the start/stop switch by placing the
start/stop switch in the START position for a few
seconds and then placing the switch in the STOP
position until fuel, free of air bubbles, flows from
vent screw A. Tighten the vent screw.
3. Loosen vent screw B at the fuel filter.
4. Toggle the start/stop switch until fuel, free of air
bubbles, flows from vent screw B. Tighten the vent
screw.
5. Loosen vent screw C at the fuel injection pump.
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