TP-6694 7/18 67Section 3 Scheduled Maintenance
3. Rotate the hand prime pump handle
counterclockwise until fuel flows from the bleed
screw. Stop pumping.
4. Tighten the bleed screw. Wipe up any fuel leakage.
5. Place the fuel valves in the normal operation
position. Open the fuel valve located between the
pipe tee and the engine. Close the fuel valves on
each side of the fuel prime pump.
3.6 Gaseous Fuel Systems
Gaseous fuel systems apply to REZG_/RZG_/ERES_
(GM/PSI Powered) and REZX_/RZX_ (Doosan
Powered) generator set models.
This section describes natural gas and liquified
petroleum gas (LPG) fuel systems that are not covered
in the engine operation manual or engine service
manual.
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.
Explosive fuel vapors can cause severe injury or death.
Take additional precautions when using the following fuels:
Propane (LPG)—Adequate ventilation is mandatory.
Because propane is heavier than air, install propane gas
detectors low in a room. Inspect the detectors per the
manufacturer’s instructions.
Natural Gas—Adequate ventilation is mandatory. Because
natural gas rises, install natural gas detectors high in a room.
Inspect the detectors per the manufacturer’s instructions.
3.6.1 Gaseous Fuel System Concept
(Single Fuel)
The gaseous fuel system uses a fuel valve with a
solenoid to control the fuel flow to the fuel regulator. The
generator set-mounted regulator reduces the fuel
pressure as fuel passes to the fuel mixer. See
Figure 3-2.
The fuel mixer controls the ratio of fuel to air under
varying load and speed conditions. Because the fuel
mixer receives fuel in a gaseous state, it does not have
to vaporize the fuel.
TP-5750-3
1. Primary regulator (supplied by gas supplier or user)
2. Pressure gauge
3. Solenoid valve (UL--listed models require 2 solenoid v alves)
4. Secondary regulator
5. Fuel mixer
1 2 3 4 5
Figure 3-2 Fuel Regulator and Valve, Typical
3.6.2 LPG Liquid Withdrawal Fuel
System Concept
With the LPG liquid withdrawal fuel system, pressurized
liquid LPG fuel passes from the tank to a vaporizer. The
vaporizer converts the liquid fuel to gas before sending it
to the fuel mixer. The system also includes a fuel valve
that shuts off the fuel flow when the engine stops.
Contact an authorized service distributor/dealer for
availability.
3.6.3 Natural Gas and LPG Conversion
Most models operate o n either natural gas or LPG fuel
by performing the fuel conversion procedure. A hang
tag on the fuel regulator may provide additional
conversion setup information. Fuel conversion may
decrease generator set output. Refer to the respective
generator set spec sheet for ratings based on fuel
selection. Changing fuel does not alter the emissions
compliance of the generator set engine. Consult your
local generator set distributor/dealer for additional
information.
Note: If a gaseous-fueled model has the fuel type
changed (LPG to natural gas or
natural gas to
LPG), order a new nameplate from an authorized
distributor/ dealer with the updated ratings and
attach to the generator set.
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