Gaseous Fuel Systems - Kohler APM402 Operation

Open this valve
Note: Generator set without a fuel/water separator shown.
Figure 31 Hand Prime Pump with Valve Positions for Fuel Priming, Typical
2. Loosen the bleed screw at the engine. Refer to the engine operation manual for location of the bleed screw(s). The
bleed screw allows air to be expelled from the fuel system when the hand prime pump is operated.
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 KG_ (Kohler Powered), (REZG_/RZG_/ERES_ (GM/PSI Powered), 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.
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.
TP-6694 9/20
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling, storing, and using fuels.
Close this valve
Open this valve
Valve Open Valve Closed
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