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Natural Gas
LPG Vapor
To ECM and
To ECM and
controller
controller
ADV-9116
Figure 7
Gaseous Fuel Connections Wiring Diagram, Single Fuel
5.2 Fuel System Changeover Kits (Dual Fuel)
A changeover fuel system kit provides automatic changeover from natural gas to LPG vapor. The primary and secondary fuels
each have a fuel solenoid valve. The primary fuel is natural gas; the secondary fuel is LPG vapor. Before starting, both fuel
solenoid valves are closed. When the generator set starts, the primary fuel solenoid valve opens. The primary fuel line has a
pressure switch in series with a relay connected to the start/run circuit.
When the primary fuel pressure drops below 1.1 kPa or 4.5 in. water column, a relay opens the secondary fuel solenoid valve
and closes the primary fuel solenoid valve. When the primary fuel pressure rises above 1.1 kPa or 4.5 in. water column, the
generator set uses the primary fuel. Contact an authorized service distributor/dealer for kit availability.
Emissions certified models use a single direct acting electronic pressure regulator (DEPR) for both fuels.
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TP-7173
10/20
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