167Section 9 Gas Fuel SystemsTP-6356 4/12
9.3.2 Gas Fuel Conversion Procedure
1. Place the generator set master switch to the
OFF/RESET position.
2. Natural Gas to LP Fuel. Use the following steps to
remove the internal spring from the fuel regulator:
Note: Not all fuel regulators require spring and
retainer removal for fuel conversion. A hang
tag on the fuel regulator identifies the
conversion procedure.
a. Remove the fuel regulator cover plug. See
Figure 9-8.
b. Remove the adjustment screw and spring from
the fuel regulator. Save the adjustment screw
and spring for possible conversion back to
natural gas.
c. Reinstall the cover plug.
d. Go to step 4.
3. LP Fuel to Natural Gas. Use the following steps to
remove the internal spring from the fuel regulator:
Note: Not all fuel regulators require spring and
retainer installation for fuel conversion. A
hang tag on the fuel regulator identifies the
conversion procedure.
a. Use the following steps to convert the
generator set to natural gas:
b. Remove the fuel regulator cover plug. See
Figure 9-8.
c. Insert the spring and adjustment screw.
d. Go to step 4.
4. Connect a manometer to check the fuel supply
pressure on the gas mixer side of the regulator
downstream of any fuel system equipment
accessories. The recommended fuel supply
pressures are shown on the generator set spec
sheet.
5. Connect a load bank rated for the full standby
nameplate rating of the generator set.
SB-527
1. Fuel regulator
2. Spring
3. Adjustment screw
4. Cover plug
1
2
34
Figure 9-8 Fuel Regulator, Typical
6. Turn off the load bank.
7. Place the generator set master switch to the RUN
position to start the generator set.
8. Allow the generator set to reach operating
temperature.
9. Gradually apply load using the load bank until the
unit is running at full load. The generator set should
be running at full load when making adjustments to
provide optimum performance.
10. Adjust the fuel supply pressure with the generator
set running at full load. Rotate the adjustment
screw on the fuel regulator until the pressure
indicated by the manometer matches the specified
pressure. Use the lower pressure value if the
generator set still provides good response and full
power. Lower-than-specified pressures may result
in poor response to load changes or lack of power.
11. Place the generator set master switch in the
OFF/RESET position to stop the generator set.
12. Reinstall the cover plug on the fuel regulator.
13. Disconnect the load bank from the generator set.
14. Disconnect the manometer from the fuel system.
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