Generac Power Systems 941-2 Service Manual page 74

Section 4.1
INTRODUCTION TO FUEL SYSTEM
IMPORTANT CONSIDERATIONS (CONTINUED)
NOTE: A PRIMARY REGULATOR, between the
tank and the fuel lockoff solenoid, is required to
ensure that correct gas pressure is delivered to
the lockoff solenoid.
• The generator installer's connection point is at the
fuel lockoff solenoid which has a 3/4 inch (female)
connection.
• A length of flexible hose is required between the
fuel lockoff solenoid and rigid fuel piping, to allow
for vibration and/or shifting of the unit. This line
must be at least six (6) inches longer than neces-
sary.
FUEL SUPPLY LINES
When servicing or repairing the gaseous fuel system,
the following rules apply to gaseous fuel supply lines:
• The LP gas lines must be accessible but must also
be protected against possible damage.
• Do NOT connect electrical wiring to any gaseous
fuel line. Do NOT route electrical wiring alongside
the gaseous fuel lines.
• Route the gaseous fuel lines AWAY from hot
engine exhaust mufflers and piping.
• Gas lines should be retained with metal clamps that
do not have any sharp edges.
Page 4.1-2
• Gaseous fuel lines and primary regulators must be
NOTE: An existing primary regulator may be used
to deliver gas to the fuel lockoff solenoid provid-
ed It has sufficient flow capacity for the generator
and other gas appliances in the circuit. If the
existing primary regulator does not have a suffi-
cient capacity (a) replace it with one that has ade-
quate flow capacity, or (b) install a separate pri-
mary regulator having at least a 67 cubic feet per
hour capacity.
Rules established by the National Fire Protection
Association (NFPA) and the Recreation Vehicle
Industry Association (RVIA) require that the LP gas
tank be equipped with an excess flow valve. This
valve and the gaseous fuel lines must be carefully
sized so the excess flow valve will close in the event
of line breakage.
Shutoff valves on the fuel supply tank and elsewhere
in the system must be fully open when operating the
generator. The excess flow valve will function proper-
ly only if all valves are fully open and fuel lines are
properly sized.
Figure 1. A Typical LP Gas Fuel System
properly sized to deliver adequate fuel flow to the
generator engine. The generator requires at least
67 cubic feet of gas per hour for its operation.
EXCESS FLOW VALVE