TP-6811 7/1686 Section 6 Component Testing and Adjustment
6.8 Fuel Systems
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling,
storing, and using fuels.
WARNING
The fuel system. Explosive fuel vapors can cause severe
injury or death. Vaporized fuels are highly explosive. Use
extreme care when handling and storing fuels. Store fuels in a
well-ventilated area away from spark-producing equipment
and out of the reach of children. Never add fuel to the tank
while the engine is running because spilled fuel may ignite on
contact with hot parts or from sparks. Do not smoke or permit
flames or sparks to occur near sources of spilled fuel or fuel
vapors. Keep the fuel lines and connections tight and in good
condition. Do not replace flexible fuel lines with rigid lines. Use
flexible sections to avoid fuel line breakage caused by
vibration. Do not operate the generator set in the presence of
fuel leaks, fuel accumulation, or sparks. Repair fuel systems
before resuming generator set operation.
Gas fuel leaks. Explosive fuel vapors can cause severe
injury or death. Fuel leakage can cause an explosion. Check
the LPG vapor or natural gas fuel system for leakage by using
a soap and water solution with the fuel system test pressurized
to 6--8 ounces per square inch (10--14 inches water column).
Do not use a soap solution containing either ammonia or
chlorine because both prevent bubble formation. A successful
test depends on the ability of the solution to bubble.
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.
The typical gaseous fuel system uses two regulators.
The primary regulator reduces the line pressure to an
allowable inlet pressure for the secondary regulator.
The secondary regulator is factory-installed on the
generator set engine and is designed for a maximum
inlet pressure of 2.7 kPa (6 oz./in.
2
) or 280 mm (11 in.)
water column. This regulator is electronically controlled.
Do not attempt to adjust the fuel mixture or engine speed
by adjusting the regulators.
The fuel system on the engine includes the electronic
fuel pressure regulator and mixer. Refer to the engine
service manuals for troubleshooting and repair of the
engine’s fuel system.
Note: The Integrated Electronic Pressure Regulator
(IEPR) and air/fuel mixer are specially calibrated
emission-control devices. Do not adjust the IEPR
or the air/fuel mixer.
Refer to the troubleshooting instructions in Section 5,
Tr oubleshooting, to identify generator set operation
problems that may be caused by an inadequate fuel
supply, incorrect adjustments, or damaged fuel system
components.
1
GM78523
1. Fuel solenoid valves (2)
2. Fuel inlet connection
2
Figure 6-14 Fuel System
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