8-22
LPG FUEL SYSTEM
WARNING
LPG is flammable and explosive
and can cause asphyxiation. NFPA 58, Section
1.6 requires all persons handling LPG to be
trained in proper handling and operating proce-
dures.
Do not smoke if you smell gas or are near LPG
containers or LPG-burning equipment or are in
an area sharing ventilation with such equip-
ment. Keep flames, sparks, pilot lights, electri-
cal arcs, arc-producing equipment, electrical
switches and all other sources of ignition well
away. Have an ABC fire extinguisher handy.
LPG models are designed for a low-pressure vapor-
withdrawal type of LPG supply system.
LPG supply
pressure at the inlet to the demand regulator must
be 9 to 13 inches (229 to 330 mm) water column
(WC) when the genset is running under full load.
The components of the genset LPG system include:
• A fuel-shutoff solenoid valve
• A demand regulator with a built-in automatic
priming solenoid which allows fuel to pass
through during cranking
• An LPG carburetor and air filter
Before servicing the LPG fuel system, check to see
that the LPG container(s) is at least half full. The
problem may be that there is not enough LPG to
provide the rate of vaporization necessary to meet
genset demand, especially on cold days and/or
when the genset is under full load.
Carefully follow the instructions for disconnecting
the LPG fuel line from the genset under
Disconnect-
ing Set from Vehicle Systems
on Page 5-4.
WARNING
LPG “sinks” and can accumulate in
explosive concentrations. Before disconnect-
ing the LPG fuel line, close the fuel shutoff
valve(s) at the LPG container(s) and move the
vehicle outside and away from pits or base-
ments or other below-grade spaces where LPG
could accumulate.
See the instructions on how to remove and replace
the carburetor under the subheadings
Air Filter and
Preheater Assembly
on Page 8-11 and
Carburetor
and Intake Manifold Assembly
on Page 8-12. Refer-
ences to preheaters and chokes are not applicable
to LPG carburetors.
Demand Regulator with Automatic
Priming Solenoid
See Figure 8-18. The demand regulator assembly
supplies fuel to the carburetor. It is usually not the
cause of fuel system problems. All other possible
causes should be checked out before adjusting or
replacing the demand regulator assembly.
LOCK-OFF ADJUSTMENT SCREW
(Beginning Spec E, this screw is neither
visible nor accessible for adjustment)
OUTLET HOSE
FITTING
INLET HOSE
FITTING
AUTOMATIC
PRIMING
SOLENOID
VENT
HOSE
FITTING
FIGURE 8-18. TOP VIEW OF DEMAND REGULATOR
WITH AUTOMATIC PRIMING SOLENOID
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