.,.,
FUEL SYSTEM
The carburetor mixes air and fuel in the correct pro-
portion for good performance. The governor oper-
ates the throttle to maintain a nearly constant en-
gine speed (frequency) as the load varies. Figure
6-15 is representative of most of the fuel system
parts beginning Spec
B.
LPG (liquified petroleum
gas) systems do not use an air preheater
or
choke
and have different fuel connections. See Choke As-
sembly, Fuel Pump and LPG System (Liquid With-
drawal and Vapor Withdrawal) in this section for oth-
er details which may be applicable.
See GOVERNOR AND CARBURETOR ADJUST-
MENTS
in
this section for carburetor adjustments.
IAwARNINGI
Gasoline
and
LPG are flammable
and
explosive
and
can cause severe
personal
injury
or
death. Do
not
smoke
if
you
smell
gas
or
gasoline
vapors
or
are
near
fuel
tanks
or
fuel-
burning
equipment
or
are
in
an
area
sharing
ventilation with
such
equipment. Keep flames,
sparks,
pilot
flames,
electrical
arcs
and
switches
and
other
sources
of
ignition
well
away.
IAwARNINGI
LPG
is
flammable
and
explosive
and
can cause asphyxiation. NFPA
58,
Section
1.6 requires
all
persons
handling
LPG
to
be
trained
in
proper
handling
and
operating
proce-
dures.
Air
Cleaner
Assembly
Disassembly:
1.
Remove the crankcase breather hose and air
preheater hose (gasoline gensets only) from
the air cleaner housing.
2. Remove the air cleaner housing center caps-
crew and lift off the housing and air filter.
3.
Prior to Spec D gasoline and Spec F LPG, re-
move the choke cover retaining nut and cover
and disconnect the leads connected at the ter-
minals.
4.
Remove the three capscrews that secure the
air cleaner adapter to the carburetor and lift off
the adapter. (One of the screws is inside the
throat of the adapter.)
Prior
to
Spec D gasoline and Spec F LPG, the
choke linkage
must
be disengaged
from
the
choke as the
air
cleaner adapter
is
being re-
moved. See Figure 6-16.
5.
Beginning Spec D gasoline, disconnect the
leads at Relay K4
or
remove the relay and
bracket from the
air
cleaner adapter.
Reassembly: Reassembly is the reverse of disas-
sembly. Use a new gasket between the adapter and
the carburetor.
lA
CAUTION! Make
sure
you
use
the
right
screws
to
mount
the
adapter
on
the carburetor. The
screw
inside
the
throat
will
interfere with the
choke
shaft
if
it
is
too
long
or
tightened
too
tight.
Take care
also
not
to
cross
thread
it.
Carburetor
And
Intake
Manifold
Assembly
Disassembly:
1. Remove the top panel (see COOLING SYS-
TEM in this section).
2.
Remove the air cleaner assembly.
3.
Disconnect the fuel line and governor rod from
the carburetor (see GOVERNOR AND CAR-
BURETOR ADJUSTMENTS
in
this section).
4.
Remove the intake manifold capscrews, the
carburetor air preheater (gasoline gensets
only) and the carburetor and intake manifold as
an assembly.
Prior
to
Spec D gasoline and Spec F LPG, disen-
gage the choke pull
off
linkage
from
the carbure-
tor. See Figure 6-17.
5.
Remove the two intake manifold gaskets and
cover the intake ports to prevent loose parts
and dirt from entering the engine.
6.
Unbolt the carburetor from the intake manifold.
Reassembly: Reassembly is the reverse of disas-
sembly. Use new gaskets between the intake man-
ifold and the engine and between the intake man-
ifold and the carburetor. Do not use sealer
on
the
gaskets. Tighten all fasteners according to
Section
4.
Torque Specifications.
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