84 TP-6694 6/22
3.6.1 Gaseous Fuel System Concept (Single Fuel)
The gaseous fuel system uses a fuel solenoid valve to control the fuel flow to the electronic-controlled pressure regulator (EPR)
or direct acting electronic pressure regulator (DEPR). The generator set-mounted EPR or DEPR reduces the fuel pressure as
fuel passes to the fuel mixer.
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.
Figure 32 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 EPR or DEPR. The system also includes a fuel solenoid 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 gaseous-fueled models can be converted to operate on either natural gas or LPG fuel. The engine ECM has fuel tables
and spark advance curves programmed for both natural gas and LPG. To change the fuel type, change the electrical connections
between the fuel system and the engine ECM as shown in the following instructions and connection diagrams. 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.
Be sure to review the respective wiring diagram for your specific model for possible special applications.
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