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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.
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 1.9 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.
Required fuel pressure for natural gas is 5 inches to
7 inches water colum (0.18 to 0.25 psi); and for
liquid propane, 11 inches to 14 inches of water
column (0.4 to 0.5 psi).
Any piping used to connect the generator to the
fuel supply should be of adequate size to ensure
the fuel pressure NEVER drops below 4 inches
water colum for natural gas or 10 inches water col-
umn for liquid propane for all load ranges.
1.7
FUEL CONSUMPTION
Model #
Nat. Gas (*)
1/2 Load Full Load
04758
66
119
04759
152
215
04760
156
220
*Natural gas is in cubic feet per hour.
**LP is in gallons per hour/cubic feet per hour.
DANGER
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.
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators
NOTE:
LP Vapor (**)
1/2 Load
Full Load
0.82/30
1.47/54
1.53/56
2.08/76
1.58/58
2.40/88
Section 1 — General Information
1.8
RECONFIGURING THE
FUEL SYSTEM
◆
1.8.1 7 KW, 410CC
To reconfigure the fuel system from NG to LP ,
follow these steps (Figure 1.3):
The primary regulator for the propane supply is
NOT INCLUDED with the generator. A fuel pres-
sure of 11 to 14 inches of water column (0.4 to 0.5
psi) to the fuel inlet of the generator MUST BE
SUPPLIED.
1. Turn off the main gas supply (if connected).
2. Open the roof and remove the door.
3. Remove the battery (if installed).
4. Disconnect wire #0 and wire #14 from the gas
solenoid on top of the demand regulator.
5. Remove the carburetor fuel hose from the outlet
port of the demand regulator.
6. Remove the demand regulator by removing the
fastener that retains the regulator mounting
bracket.
7. Remove the square headed steel pipe plug from
outlet port #1 and the brass hose barb fitting
from outlet port #2.
8. Refit the brass hose barb fitting to outlet port #1
and the square headed steel pipe plug to outlet
port #2.
9. Reverse procedure steps 1-5 to reinstall demand
regulator.
10. Reverse the procedure to convert back to natural
gas.
Figure 1.3 – Demand Regulator
FUEL HOSE
BRASS HOSE
FITTING
ADJUSTMENT
SCREW
NG FUEL SYSTEM
The natural gas adjustment screw is preset during
installation and should not need any further
adjustment.
Generac® Power Systems, Inc.
NOTE:
HOSE & PLUG
SWITCHED SIDES
PIPE
PLUG
FUEL JET
LP FUEL SYSTEM
NOTE:
FUEL HOSE
BRASS HOSE
FITTING
OUTLET
PORT
7
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