181Section 9 Gas Fuel SystemsTP-6356 4/12
D Attach a user supplied 18-ga. jumper wire
between terminals 1 and 5 (LP gas vapor
fuel). See Figure 9-39 for frequency jumper
wire requirements.
Note: No jumper wire is used with natural
gas fuel.
D Attach the junction box right side panel.
5. Change the solenoid shutoff valve wiring (80/100
kW models only).
a. Locate the solenoid shutoff valve at the fuel
inlet connection at the lower right side of the
generator set.
b. Disconnect wires 72 and 73 from the solenoid
shutoff valve (FV1). Tape to insulate the
terminals. See Figure 9-40, Natural Gas view.
c. Connect wires 74 and 75 to the solenoid shutoff
valve (FV1). See Figure 9-40, LP Gas view.
6. 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 power to the battery charger, if
equipped.
d. Open the LP gas supply valve.
7. Change the engine ignition timing (30--60 kW
models only).
Note: The engine ignition timing for the 80--
125 kW models is set by the ECM and is not
adjustable.
a. 30 kW model with the 3.0 L GM engine only.
Remove the 4-pin harness connector from the
base of the distributor. Plug in GM39651
service harness adapter to the distributor.
Attach the lead from pin B to the battery
positive (+) terminal.
The service harness adapter connects pins C
and D together and connects battery positive
(+)topinB.
b. Loosen the distributor hold-down clamp screw.
c. Remove dirt and grease from the crankshaft
pulley groove and engine timing plate mark
using a clean rag. Highlight the timing marks
with chalk.
GM34401B-D
Figure 9-40 Solenoid Shutoff Valve Wiring
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