178 Section 9 Gas Fuel Systems TP-6356 4/12
6. Remove the oxygen sensor.
a. Allow the generator set exhaust system to cool.
b. Disconnect the DVM leads from the oxygen
sensor.
c. Remove oxygen sensor from the exhaust tube.
d. Apply a small amount of antiseize compound to
the pipe plug and reinstall the pipe plug into the
exhaust tube.
7. Restore the generator set to service.
a. Check that the generator set master switch is in
the OFF position.
b. Reconnect the generator set engine starting
battery, negative (--) lead last.
c. Reconnect the power to the battery charger, if
equipped.
9.11 Natural Gas to LP Gas Vapor
Conversion
(30--125 kW GM-Powered Models with
Woodward and E-Controls Governor)
Adapted from Service Bulletin SB-633.
This section provides instructions for converting General
Motors engine-powered generator sets from natural gas
to LP gas vapor. Figure 9-31 lists specification numbers
for generator sets including engine models.
Model, kW Engine Spec No.
30
4.3 L GM22383-GA1, 7, 10
3.0 L GM22316-GA1
35 4.3 L GM22383-GA2, 8, 11
45 4.3 L GM22383-GA3, 9, 12
50
5.7 L GM13686-GA1, 3, 5, 7
5.0 L GM21302-GA1, 5, 7
60 5.7 L GM21302-GA2, 6, 8
80 8.1 L GM22407-GA1, 2, 3, 4
100 8.1 L GM22407-GA5, 6, 7, 8
125 8.1 L
GM20568-GA1, 2
GM25339-GA1, 2, 3, 4
Figure 9-31 Specification Numbers
Figure 9-32 shows the natural gas configuration for the
50/60 kW models; the 30--45 kW and 80--125 kW
models are similar.
ADV-6549
1. Fuel mixer
2. Reducer bushing
3. Fuel regulator (downward position)
4. Fuel line elbow
5. Fuel line
6. Fuel line union connector
1
3
4
5
6
2
Figure 9-32 Fuel System Configuration, Typical
When converting the 80--125 kW models, order the
respective kit shown in Figure 9-33 that contains the LP
gas mixer and fuel regulator.
Model, kW Kit Number
80 GM17010-KP2
100 GM17010-KP3
125 GM17010-KP4
Figure 9-33 Fuel System Kit Numbers
30--60 kW Models (3.0 L, 4.3 L, 5.0 L, and 5.7 L GM
Engines). Use the following procedure except for
Step 2. The 30--60 kW generator sets do not require gas
mixer or regulator replacement. Refer to respective spec
sheet for generator set ratings based on fuel selection.
Note: 30 kW models with the 3.0 L GM engine require
service harness adapter part number GM39651
for setting the engine ignition timing.
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