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Installation
2.5
LP GAS FUEL SYSTEM
LP gas is highly EXPLOSIVE. The gas is heavier
than air and tends to settle in low areas. Even
the slightest spark can ignite it and cause and
explosion. Only competent, qualified people
should be allowed to install, test, adjust or
service an LP gas fuel system. Install the
optional fuel system in compliance with appli-
cable codes, standards and regulations. After
the installation, do not do anything that might
render the system in noncompliance with appli-
cable codes and standards.
2.5.1 PARTS NOT INCLUDED IN FUEL SYSTEM
The propane fuel system does NOT include such items as (a) gas
tank, (b) gas piping, (c) fittings, (d) valves, and (e) primary regula-
tor, used to store the gaseous fuel and deliver it to the gaseous fuel
solenoid (Figure 2.11).
Use only approved components in the fuel sup-
ply system. All components must be properly
installed in accordance with applicable codes.
Improper installation or use of unauthorized
components may result in fire or an explosion.
Follow approved methods to test the system
for leaks. No leakage is permitted. Do not allow
fuel vapors to enter the vehicle interior.
Figure 2.11 – Typical Propane Gas Fuel System
30
2.5.2 SOME IMPORTANT CONSIDERATIONS
When installing an LP gas system, consider seriously the following
items:
•
All fittings, lines, hoses and clamps must be tight and free of
leaks. Apply a pipe sealant to threads when assembling thread-
ed connections. This reduces the possibility of leakage.
•
Test the entire fuel system for leaks using approved test meth-
ods.
•
Optimum gas pressure at the inlet to the gaseous fuel solenoid
valve and secondary regulator is 11 inches water column.
•
The installer's fuel supply connection point is at the gaseous fuel
solenoid valve. This is a 3/4-inch (female) connection. Provide
a suitable 3/4-inch NPT (male) connector to attach to the fuel
supply line.
•
Use a length of approved flexible fuel hose between the gaseous
fuel solenoid valve and rigid gas piping. The flexible line should
be at least 6 inches longer than necessary.
2.5.3 VAPOR WITHDRAWAL
LP gas is stored in pressure tanks as a liquid. The gas systems
used with these generators were designed only for vapor with-
drawal type systems. Vapor withdrawal systems use the gas
vapors that form above the liquid fuel in the tank. Do NOT attempt
to use the generator with any liquid withdrawal type system.
2.5.4 PRIMARY REGULATOR
Gas pressure delivered to the solenoid valve must be properly
regulated by means of a primary gas regulator. Mount the primary
regulator at the gas tank outlet or in the supply line from the gas
tank. The following rules apply:
•
For best results, the primary regulator supplies gaseous fuel to
the secondary regulator at 11 inches water column. Do NOT
exceed 14 inches water column.
•
The installer must be sure the primary regulator is rated at
sufficient gas flow to operate the generator plus all other gas
appliances in the circuit.
Recommended MINIMUM gas flow rate for air-cooled genera-
tors is 67 cubic feet per hour.
If an existing primary gas regulator does not have a sufficient
flow capacity for the generator and other gas appliances in the
circuit, (a) install a primary regulator with adequate flow rate,
or (b) install a separate regulator only and rated at least 67
cubic feet per hour. The inlet side of any primary regulator that
supplies the generator must connect directly to a gas pressure
tank. Do NOT tee the generator line into a gas circuit feeding
other areas.
NOTE:
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