6. Fuel System
6-1
GENERAL
This installation manual covers gasoline and LPG
(liquid propane gas) fuel systems. Separate proce-
dures are given for each.
WARNING
Fuel presents the hazard of fire or
explosion which can result in severe personal
injury or death. Do not smoke or allow any
spark, pilot light, arcing switch or equipment, or
other ignition sources in the installation area or
areas sharing ventilation. Keep a type ABC fire
extinguisher nearby. The ventilation system of
the installation area must provide a constant
flow of air to expel any accumulation of fuel va-
por while the vehicle is in transit. Compart-
ments must be vapor tight to the vehicle interior
to prevent any fumes from entering the vehicle
interior.
GASOLINE FUEL SYSTEM
Fuel System Provisions
On some vehicles, genset installations may be de-
signed to share the vehicle fuel supply tank with the
vehicle engine. Use a separate fuel pickup tube in
the vehicle tank, or use a separate tank. Do not tie
into the vehicle engine fuel supply line. See
Fuel
Line Installation
in this section.
The genset includes a fuel shut-off valve as a safety
feature and is an integral part of the fuel pump.
Should the vehicle fuel tank become pressurized,
the positive fuel shut-off valve prevents flooding of
the genset when the set is not operating.
Recommended Fuel
Use clean, fresh, unleaded or regular grade gaso-
line. Using unleaded gasoline results in extended
periods between service, longer spark plug life, and
reduced carbon clean-out maintenance If regular
gasoline is used, lead deposits must be removed
from the cylinder heads as required to alleviate en-
gine power loss, Unleaded gasoline may be safely
used after lead deposits have been removed.
CAUTION
Lead deposits can cause engine
damage if they are not removed before using
unleaded gasoline. Do not alternate between
leaded (regular) and unleaded gasoline.
WARNING
Fuel presents the hazard of fire or
explosion that can cause severe personal injury
or death. Never fill the fuel tank when the engine
is hot or is running. Do not permit any flame,
spark, pilot light, cigarette or other ignition
source near the fuel system.
Fuel Consumption
See Section
2. Specifications
in this manual.
Fuel Line Installation
Vehicle fuel systems are designed to operate within
a particular range of fuel pressure. It is very impor-
tant that the vehicle fuel supply system not be al-
tered when the genset is being installed. The fuel fill
tube, fill limiter vent, vapor canister, vapor lines, and
gas fill cap should not be changed, removed, or re-
placed without the approval of the vehicle manufac-
turer. Check the filler cap and see that the pressure
vacuum relief valve is functioning properly— re-
place if it is necessary.
If a separate connection is not supplied for the gen-
set, add a second fuel pickup in the tank. Onan rec-
ommends a separate fuel pickup tube in the vehicle
fuel tank to provide a proper and safe fuel pressure
at the genset carburetor. The opening of this pickup
tube should not extended into the bottom 1/4 of the
tank so that the last 1/4 tank of gasoline is reserved
for vehicle operation only.
Do not tie the genset fuel line into the vehicle
fuel supply line.
• Tying a genset fuel line into a vacuum supply
line (vehicle fuel pump at the tank side of the
pump) may cause the genset to starve for fuel
at highway speeds or during acceleration.
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