Service manual

9-2013 4. Service
NOTICE
Make sure the diaphragm is in a vertical plane (as in the genset) when performing a bench
test, otherwise the weight of the diaphragm will cause erroneous readings of lock-off
pressure.
Vent Hose: Make sure to reconnect the regulator vent hose to the vent insect screen as
required.
4.5.6 Fuel Solenoid
Test for Leakage: If there is a smell of gas when the genset is not running, or any other reason
to suspect that the valve is leaking, connect the inlet of the valve to a source of air pressure
regulated to not more than 14 inches WC (35 cm) and disconnect the outlet hose. Replace the
solenoid if it leaks. Use a soap bubble to check for leakage.
Test for Operation: Disconnect the solenoid from the generator set wiring harness and connect
it to a 12 volt battery while the source of air pressure is still connected. Replace the solenoid if it
does not open.
First Start: Upon the first connection of the fuel, especially in LP systems, it is possible for a
spike of pressure greater than the operating strength of the fuel solenoid to pass through the
main regulator and to lock the solenoid into an inoperable position. This issue can be reduced
by using a two-stage regulator at the tank.
If the situation occurs:
1. Close the main valve at the tank and vent the fuel from the line at the tank.
2. Start the crank cycle at the genset and then turn on the fuel at the tank while the engine is
cranking.
NOTICE
Multiple crank attempts may be required to purge the fuel line, depending on the
length of the run.
4.5.7 Low Gas Pressure Switch (If Equipped)
Disconnect the pressure switch from the generator set wiring harness and check for electrical
continuity across its terminals while connected to a source of air pressure regulated to not more
than 14 inches WC (35 cm). Replace the switch if it does not close when air pressure is applied
or open when pressure is released.
4.5.8 Testing the Fuel System for Leaks
WARNING
Fuel presents the hazard of explosion or fire which can result in severe personal injury
or death. Do not smoke or allow any flame, spark, pilot light, arc-producing equipment,
switch or other ignition sources around fuel or fuel components.
Before operating the generator set, test the fuel system for leaks.
• Energize the fuel solenoid from a separate 12-volt DC source before testing the fuel
system
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