TP-6519 8/1770 Section 5 Component Testing and Adjustment
5.12.3 Fuel Conversion
The multi-fuel system allows conversion from natural
gas to LP vapor (or vice-versa) in the field while
maintaining emissions-standard compliance. A trained
technician or an authorized distributor/dealer can
convert the fuel system.
For LP vapor fuel, an orifice is used in the fuel line. The
unit is typically shipped set up for natural gas, with the
loose orifice tied near the fuel line. To convert to LP
vapor, install the orifice and disconnect the spark
advance leads as described below. See Figure 5-32
and Figure 5-33.
6
1. Fuel hose with clamp
2. Hose fitting (LP orifice fits inside; see Figure 5-34)
3. Regulator
4. DSAI connector location (see Figure 5-35)
5. Fuel valve
6. Fuel inlet, 1/2 in. NPT female
2
GM51561A-D
4
1 3
5
Figure 5-33 Fuel System Components, Air Inlet Side
Procedure to Convert from NG to LP
1. Place generator set master switch in OFF position.
2. Disconnect the power to the battery charger.
3. Disconnect the generator set engine starting
battery, negative (-- ) lead first.
4. Turn off the fuel supply.
5. Remove the hose clamp and fuel hose from the
hose fitting. See Figure 5-33.
6. Place orifice into the hose fitting. See Figure 5-34.
1. LP orifice
2. Hose fitting
3. Regulator
1
2
3
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Figure 5-34 LP Fuel Orifice Installation
7. Slide the hose onto the hose fitting and secure it
with the clamp.
8. Disconnect digital spark advance ignition (DSAI)
timing leads 65 and N5 for LP. See Figure 5-35.
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1. DSAI leads 65 and N5: connect for natural gas,
disconnect for LP
1
Figure 5-35 Digital Spark Advance Ignition Timing
Leads (located in generator set air intake
area)
9. Connect and turn on the new fuel supply.
10. Check that the generator set master switch is in the
OFF position.
11. Reconnect the generator set engine starting
battery leads, negative (--) lead last.
12. Reconnect power to the battery charger.
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