FUEL
SYSTEM
Ford engines used on EK/EM sets are designed to
operate on gasoline (average regular grade of 93
octane),
natural gas with thermal rating of 1000
BTU/ft
3
(37.25 MJ/m
3
) or liquefied petroleum gas
(LPG) Propane at 2500 BTU/ft
3
(93.13 MJ/m
3
).
FUEL
CONNECTIONS
Before starting any type of fuel installation, ONAN
recommends that the regulations described in
Pamphlet 58 of the National Fire Prevention Associa-
tion (NFPA) be studied. All pertinent state and local
codes, most of which are governed by NFPA 58, must
be complied
with,
and the installation must be
inspected before the unit is put in service.
Fuels under pressure (e.g. natural gas or LPG) must
be controlled by a positive shut off valve, preferably
automatic, in addition to any valve integral with the
carburetor or gas regulator equipment.
Connection of gasoline fuel inlet line requires a 1/8-
inch pipe fitting to an adapter on skid base.
Lift to fuel pump should not exceed 6 feet (2 m),
horizontal distance between set and fuel tank should
not exceed 50 feet (15 m). Use 3/8-inch tubing up to
25 feet (12.5 m),
1/2-inch
up to 50 feet (15 m).
Optional Day Tank: The engine may be equipped with
a one quart reservoir tank to replenish fuel lost from
the carburetor by evaporation during shutdown. See
Figure 13. Connect a 5/16-inch return line between
the reservoir upper side fitting (this fitting has a
restricted orifice and must be used) and the main
supply tank. Be sure the return line has a continuous
drop to the main supply tank with no dip-and-nse
where fuel could collect and form a vent
seal.
Seethat
the top center opening of the tank is tightly plugged.
Natural or Manufactured Gas: On sets equipped with
an Impco carburetor, gas pressure atthe carburetor
must be set at 3-ounces (1.3 kPa) gauge, or 5-inch
(127 mm) water column, manometer, with the engine
running at 1800
r/min
on no
load.
Thermae regulator is designed for a maximum line pressure of 6-
ounces(2.6 kPa) gauge, or 10.38-inches (263.6 mm) water column,
manometer.
If line pressure is excessive, install asuitable pressure
reducing regulator. Be sure to comply with all local
regulations such as:
• Recommended electric shutoff valve.
• Hand shutoff valve at the fuel source.
• Supply line filter.
Use a short length of approved flexible connection
between the supply pipe and the set regulator inlet.
Combination Gas-Gasoline: Combination gas-
gasoline sets are designed for normal operation on
gas
fuel,
with provision for emergency operation on
gasoline. Both gas and gaso procedures must be
followed.
A reservoir tank is sometimes provided, so a
fuel return line may be necessary as described for
gasoline
fuel.
BATTERY
Starting the unit requires 12-volt battery current. Use
one 12-volt (see specification) battery for a normal
installation. Connect the battery as in Figure 14.
Necessary battery cables are on unit. Service battery
as necessary. Infrequent set use (as in emergency
standby service) may allow battery to self-discharge
to the point where it cannot start the unit. If installing
an automatic transfer switch that has no built-in
charge circuit, connect a separate trickle charger.
Onan automatic transfer switches include such a
battery charging circuit.
WARNING \
Do no, snloke while
servicing batteries. Lea«S
^HMi^M^i acid batteries give off explosive gases while
being charged.
RESERVOIR (DAY) TANK INSTALLATION
RESERVOIR TANK
RESTRICTED
OUTLET
RETURN_UNE TO
UNDERGROUND
FUEL TANK
LINE FROM
FUEL PUMP
LINE TO
CARBURETOR
STARTER
(AUTOMOTIVE)
ENGINE
GROUND
12 V. BATTERY (TYPE 3EE)
72 A.H. (25g kc)
FIGURE 13. DAY TANK INSTALLATION
FIGURE 14. BATTERY CONNECTION
18
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