Final Operating Test; Fuel Shutoff Valve; Fuel Pressure Test Port Location - Generac Power Systems Protector Series Installation Manuallines

Gaseous Fuel Systems

Final Operating Test

A correctly configured and sized fuel system provides the
fuel volume and fuel pressure required for the generator
set to operate correctly in all modes of operation. To ver-
ify correct fuel system operation, a series of tests must
be performed as described below.

Fuel Shutoff Valve

Most applications will require an external manual fuel
shutoff valve on the fuel line. The fuel shutoff valve must
be readily accessible. Local codes determine correct
location.
Figure 4-4. Fuel Shutoff Valve with Manometer Port
NOTE: Figure 4-4 illustrates a fuel shutoff valve with a
manometer port for making fuel pressure checks. This
accessory fuel shutoff valve permits making pressure
checks without going into the generator enclosure.
Valves available through Generac and IASD's:
• 1-1/4 in pressure rated ball valve; part number
0L2844
• 1-1/2 in ball valve; part number 0L2856
•
2 in ball valve; part number 0L2846
26

Fuel Pressure Test Port Location

1. See Figure
or water manometer, measure fuel pressure to the
generator at a test port located at the fuel solenoid
shutoff valve(s).
NOTE: Take necessary readings as quickly as possible.
Severe deformation of valves may occur if gauge adapter
probe is left in test port plug for a period of hours or days.
NOTE: Below 45 °F (7 °C), the neoprene core of the plug
does not recover its original shape as rapidly as it would
at higher temperatures. Upon removal of gauge adapter
probe, valves may not close fully and immediately, or
they may remain slightly open until operating tempera-
ture is above 45 °F (7 °C). Lower pressures and the
length of time gauge adapter probe is inserted can also
affect valve closing rate. The protective cap is provided to
eliminate the small amount of leakage that might occur
following removal of the gauge adapter probe.
2. Tighten protective cap to prevent tampering.
000743
Installation Guidelines For Spark-Ignited Stationary Generators
4-5. Using a suitable pressure gauge