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Generac

Power Systems, Inc.

1.6

FUEL REQUIREMENTS
AND RECOMMENDATIONS

With LP gas, use only the vapor withdrawal
system.

This type of system uses the vapors formed

above the liquid fuel in the storage tank.

Gaseous fuels such as natural gas and liquid
propane (LP) gas are highly explosive. Even the
slightest spark can ignite such fuels and cause
an explosion. No leakage of fuel is permitted.
Natural gas, which is lighter than air, tends to
collect in high areas. LP gas is heavier than air
and tends to settle in low areas.

The engine has been fitted with a fuel carburetion
system that meets the specifications of the 1997
California Air Resources Board for tamper-proof dual
fuel systems. The unit will run on natural gas or LP
gas, but it has been factory set to run on natural gas.
Should the primary fuel need to be changed to LP
gas, the fuel system needs to be reconfigured. See
Section 1.8 for instructions on reconfiguration of the
fuel system.
Recommended fuels should have a Btu content of at

least 1,000 Btus per cubic foot for natural gas; or at

least 2,520 Btus per cubic foot for LP gas. Ask the

fuel supplier for the Btu content of the fuel.
Fuel pressure for both natural gas and liquid

propane set ups should be

11 inches to 14 inches

of water column (0.6 psi)

at all load ranges.

NOTE:

A separate gas line and regulator may be needed
to assure proper gas pressure (11-14”) to the gen-
erator. Low gas pressure can cause hard starting
and could affect engine durability.

1.7

FUEL CONSUMPTION

*Natural gas is in cubic feet per hour.
**LP is in gallons per hour/cubic feet per hour.

1.8

RECONFIGURING THE
FUEL SYSTEM

1.8.1 7 KW, 410CC

To reconfigure the fuel system from NG to LP,
follow these steps:

1. Turn the main gas supply off.
2. Remove the carburetor fuel hose from the outlet

port of the demand regulator (Figure 1.3).

3. Disconnect wire #0 and wire #14 from the gas

solenoid located on the top of the demand regu-
lator.

4. Remove the demand regulator by rotating coun-

terclockwise.

5. Remove the brass hose fitting from the outlet port

of the demand regulator.

6. Remove the brass metering jet (loosen counter-

clockwise) from the housing port of the demand
regulator located on the side of the regulator.

7. Install new LP metering jet (tighten clockwise) in

the outlet port of the demand regulator.

8. Refit the brass hose fittings to the outlet port of

the demand regulator.

9. Reverse procedure steps 1-4 to reinstall demand

regulator.

10. Reverse the procedure to convert back to natural

gas.

Figure 1.3 – Demand Regulator

NOTE:

The natural gas adjustment screw is preset during
installation and should not need any further
adjustment.

1.8.2 12KW AND 15KW, 990CC ENGINES

To reconfigure the fuel system from NG to LP,
follow these steps:

NOTE:

The primary regulator for the propane supply is
NOT INCLUDED with the generator. There must be
fuel pressure of 11 to 14 inches of water column
(0.6 psi) to the fuel inlet of the generator.

1. Turn off the main gas supply.
2. Remove the three carburetor fuel hoses from the

outlet ports of the demand regulator.

3. Disconnect wire #0 and wire #14 from the gas

solenoid located on the top of the demand regu-
lator.

4. Remove the demand regulator from the enclosure

by rotating counterclockwise.

◆

FUEL JET

NG FUEL SYSTEM

LP FUEL SYSTEM

BRASS HOSE

FITTING