TP-6735 7/1778 Section 5 Component Testing and Adjustment
5.11 Fuel Systems
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling,
storing, and using fuels.
WARNING
The fuel supplier provides and maintains manual
shut-off valves and the primary regulator. See the
generator set installation manual for fuel pipe size
recommendations. Verify that the fuel system capacity
is adequate to supply the generator set plus all other gas
appliances.
A factory-installed secondary regulator and 12 VDC
solenoid valve are located in the front air intake
compartment. The controller energizes the fuel
solenoid v alve to open at startup and deenergizes the
valve to close at shutdown. The secondary fuel
regulator reduces fuel pressure for delivery to the fuel
block. The fuel flows from the fuel block to the
carburetor in a gaseous state. The carburetor mixes the
fuel with intake air for consumption by the engine.
Refer to the troubleshooting instructions in Section 3,
Troubleshooting, to identify generator set operation
problems that may be caused by an inadequate fuel
supply, incorrect adjustments, or damaged fuel system
components. Then use the instructions in this section to
check fuel system components.
5.11.1 Fuel Solenoid Valve
A solenoid valve upstream of the regulator and the
flexible fuel connector provides automatic fuel on/off
control. See Figure 5-27 or Figure 5-28. The engine
starting battery powers the solenoid valve and the
engine starting controls open the valve when the engine
cranks or runs.
Fuel Valve Operation Test Procedure
1. Disconnect the positive (+) battery lead from the
gas valve terminal.
2. Apply 12 VDC to the gas valve terminal and listen
for an audible click, indicating that the valve
actuates.
3. Replace the gas valve if it does not actuate in
step 2.
5.11.2 Digital Spark Advance Ignition
(DSAI) Timing
The digital spark advance ignition (DSAI) optimizes the
engine timing for the selected fuel, natural gas or LP.
The DSAI timing leads are located near the fuel solenoid
valve. See Figure 5-27 or Figure 5-28. Connect the
DSAI leads together for natural gas fuel. Disconnect the
leads if LP is used. See Figure 5-26.
See the engine service manual for ignition system
service information.
DSAI Timing Lead Connection
Natural Gas Connect
LP Disconnect
Figure 5-26 DSAI Lead Connection
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