Generac Power Systems NP-40G - Manual (Page 69)

Section 4.1- INTRODUCTION TO FUEL SYSTEM
Important Considerations (Contin­
ued)
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.
n 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 necessary.
□ Gas lines should be retained with metal clamps
that do not have any sharp edges.
□ Gaseous fuel lines and primary regulators must
be 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.
NOTE: An existing primary regulator may be used
to deliver gas to the fuel lockoff solenoid provided
It has sufficient flow capacity for the generator and
other gas appliances In the circuit. If the existing
primary regulator does not have a sufficient capac­
ity (a) replace It with one that has adequate flow
capacity, or (b) Install a separate primary regulator
having at least a 67 cubic feet per hour capacity.
Fuei Suppiy Lines
When servicing or repairing the gaseous fuel
system, the following ruies 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 gas­
eous fuel line. Do NOT route electrical wiring
alongside the gaseous fuel lines.
n Route the gaseous fuel lines AWAY from hot
engine exhaust mufflerts and piping.
Figure 1. A Typical LP Gas Fuel System
Excess Fiow Vaive
Rules established by the National Fire Protection
Association (NFPA) and the Recreation Vehicle In­
dustry Association (RVIA) require that the LP gas
tank be equipped with an excess flow valve, mis
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 else­
where in the system must be fully open when oper­
ating the generator. The excess flow valve will
function properly only if all valves are fully open
and fuel lines are properly sized.
VAPOR
WITHDRAWAL
vTANK
LP GAS
CARBURETOR
regulator .
FUEL
LOCKOFF
SOLENOID
r
-------------
V
11-14 Inches
of water
T
Page 4.1-2