TP-6881 7/15 99Section 5 Component Testing and Adjustment
5.13.3 Fuel Regulators
The typical gaseous fuel system uses two regulators.
The primary regulator reduces the line pressure to an
allowable inlet pressure for the secondary regulator.
The fuel supplier provides and maintains the primary
regulator. The secondary regulator is factory-installed
on the generator set and is designed for a maximum
inlet pressure of 2.7 kPa (6 oz./in.
2
) or 280 mm (11 in.)
water column.
Note: Do not attempt to adjust the fuel mixture or engine
speed by adjusting the regulators.
The fuel lockoff prevents fuel flow when the engine is not
operating. See Figure 5-27. Do not try to adjust the fuel
pressure, fuel mixture, or engine speed using the fuel
lockoff.
Checking the Fuel Pressure
Use a gauge or manometer to check the fuel pressure at
the secondary regulator inlet. See Figure 5-27.
Measure the fuel pressure with the generator set
running at rated load. Contact the fuel supplier if the
inlet pressure is not within the range shown in
Figure 5-26.
Fuel Fuel Pressure Required
Natural Gas 0.87--2.7 kPa (3.5--11 inches H
2
O)
LPG 1.7--2.7 kPa (7--11 inches H
2
O)
Figure 5-26 Fuel Pressure Requirements
GM71184
1. Fuel lockoff (do not adjust)
2. Fuel inlet, 1/2 in. NPT
3. Inlet pressure check location
1
2
3
Figure 5-27 Fuel Regulator
5.14 Fuel Conversion
The multi-fuel system allows conversion from natural
gas (NG) to LPG (or vice-versa) in the field while
maintaining emissions-standard compliance. A trained
technician or an authorized distributor/dealer can
convert the fuel system.
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or equipment connected to the set, disable the
generator set as follows: (1) Press the generator set off/reset
button to shut down the generator set. (2) Disconnect the
power to the battery charger, if equipped. (3) Remove the
battery cables, negative (--) lead first. Reconnect the negative
(--) lead last when reconnecting the battery. Follow these
precautions to prevent the starting of the generator set by the
remote start/stop switch.
Risk of fire.
Can cause severe injury or death.
Do not smoke or permit flames or
sparks near fuels or the fuel system.
WARNING
Servicing the fuel system. A flash fire can cause severe
injury or death. Do not smoke or permit flames or sparks near
the carburetor, fuel line, fuel filter, fuel pump, or other potential
sources of spilled fuels or fuel vapors. Catch fuels in an
approved container when removing the fuel line or carburetor.
To Next Page
Loading...
Need help?
General
