TP-5867 11/0254 Section 6 Component Testing and Adjustment
IN
OUT
3
2
4
1
1. Secondary pressure regulator
2. Fuel metering valve (single-fuel models)
3. Inlet pressure check location (plug)
4. Fuel solenoid valve
5. Fuel lockoff
A-227531-C
TP-5868
1
5
Figure 6-27 Fuel Regulator and Valve
6.11.4 Fuel Conversion, Single-Fuel
Models
Do not change the fuel on emission-certified single-fuel
generator sets. The fuel systems on emission-certified
units are factory-set and sealed to meet EPA and
California emissions regulations. Emission-certified
units bear a decal similar to the one shown in
Figure 6-28.
* Spark-Ignited Small Off-Road Engines
*
Figure 6-28 Emission-Certification Decal, Typical
Generator sets that do not have emission-certified
engines can be converted from natural gas to LP or
vice-versa in the field. Follow the procedure in Section
6.11.5 to adjust the fuel metering valve when changing
fuels. When switching from natural gas to LP gas or
vice-versa, verify that the engine speed meets
specifications. The electronic governor should
compensate for different types of fuel and maintain the
rated engine speed. If the engine speed is incorrect,
refer to Section 6.9, Electronic Governor, to make
adjustments.
6.11.5 Fuel Metering Valve Adjustment
Note: Do not adjust the fuel metering valves on
emissions-certified generator sets.
The fuel system is factory-adjusted to comply with
applicable emission standards and to provide the best
possible hot and cold starting. The fuel metering valves
are sealed to discourage field adjustments. If the fuel
system requires adjustment, only trained, authorized
service technicians may adjust the fuel metering valves.
The adjustment procedure requires a digital volt meter
(DVM), oxygen sensor (A-345052) for the engine, and a
load bank capable of the rated kW for the fuel being
used. Always use an oxygen sensor when adjusting the
fuel metering valves.
Observe the following safety precautions while
performing the procedure.
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