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6.4.1 FUEL TANK
Either the generator must share the vehicle engine's fuel
tank, or you must install a separate fuel tank for the
generator set. All fuel tanks installed on the vehicle
must be constructed, installed and restrained so they
comply with applicable codes, standards and regula-
tions.
If the generator is to share the vehicle engine's tank, sep-
arate fuel pickup tubes are required for the engine and
the generator. Generac recommends that you make the
fuel pickup tube 2 to 3 inches (51 to 76 mm) shorter
than the vehicle engine's pickup tube. This prevents the
generator from depleting the entire fuel supply during
prolonged generator operating periods.
Do NOT tee the generator fuel supply line into
the vehicle engine fuel supply line. If this is done,
the generator will be starved of fuel when both
engines are operating at the same time. Also,
while the vehicle engine is not running, generator
operation may drain the vehicle engine supply
line, making it difficult to start the vehicle engine.
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6.4.2 GENERATOR FUEL SUPPLY LINE
6.4.2.1 Rigid Fuel Lines
Those lines used to supply fuel from a tank to the gen-
erator must comply with applicable codes, standards
and regulations. The following general rules apply to
rigid fuel lines:
• Rigid lines should be of annealed, seamless, drawn
aluminum or steel.
• Lines and fittings must comply with SAE J512F ,
"Standard Automotive Fittings," or with ANSI
B126.26 (latest edition).
• Route the fuel line so that at least 2 inches (51 mm)
of clearance is maintained between the line and any
exhaust system parts.
• Do not attach electrical wiring to fuel lines. Route the
wiring so it cannot come into contact with any fuel
line.
• Route fuel lines so if they leak, fuel does not drip onto
any electrical or exhaust system parts.
• Use nonferrous metal straps without sharp edges to
secure fuel lines.
6.4.2.2 Flexible Fuel Line
Use an approved flexible length of fuel hose between the
generator fuel inlet connection and rigid fuel lines. This
prevents breaking of the line caused by vibration, shift-
ing, settling or movement. The following rules apply:
• The flexible hose must comply with SAE J30B,
"Standard for Fuel and Oil Hose." It must be
approved for use with gasoline.
28 Generac
Power Systems, Inc.
®
Section 6 – Installation
PRIMEPACT 66G and 66LP Recreational Vehicle Generators
• The hose should be at least 6 inches (152 mm) longer
than is needed to prevent the hose from rupturing if
the generator shifts or settles.
6.5
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 explo-
sion. 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 applicable codes, standards and
regulations. After the installation, do not do any-
thing that might render the system in noncompli-
ance with applicable codes and standards.
The LP powered range of generators are fitted with a
nonadjustable, factory set system. These systems are
tamper-proof to meet 1997 California Air Resources
Board requirements for engine emission.
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6.5.1 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 regulator, used to store the gaseous fuel and
deliver it to the gaseous fuel solenoid (Figure 2.15, Page
29).
Use only approved components in the fuel supply
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.
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