8-8
GASOLINE FUEL SYSTEM—HGJAB,
HGJAC, HGJAE, HGJAF
See the Operator’s Manual for recommended fuels
and Section 13. Specifications for fuel consumption
rates.
WARNING
Gasoline is flammable and explo-
sive and can cause severe personal injury or
death — Do not smoke — Keep flames, sparks,
pilot lights, switches, arc-producing equipment
and all other ignition sources away from fuel,
fuel components and areas sharing ventilation
— Keep an ABC fire extinguisher handy.
CAUTION
Unauthorized modifications or re-
placement of fuel, exhaust, air intake or speed
control system components that affect engine
emissions are prohibited by law in the State of
California.
Operation
Gasoline and combustion air are mixed in the prop-
er ratio in the carburetor (Figure 8-9) for good start-
ing and good performance over the entire load
range. The mechanical governor (Page 8-20) oper-
ates the throttle in the carburetor to maintain
constant engine speed (within a range of 5 percent)
as load varies.
Removing Carburetor
The carburetor can be removed without removing
the genset enclosure. Referring to Figure 8-9, re-
move the carburetor as follows:
1. Disconnect the fuel hose at the carburetor.
2. Disconnect the governor linkage (Page 8-19).
3. Disconnect the leads to the the choke heater
and fuel cutoff valve (Figure 8-10).
4. Remove the air filter cover and filter element
and remove the two support screws in the back
of the filter enclosure as well as the two carbu-
retor mounting nuts.
5. Pull away the air filter enclosure and carburetor.
Drain as much of the fuel in the float bowl by
turning the carburetor upside down over a
waste fuel container.
6. Avoid removing the carburetor through studs
from the intake manifold. Otherwise, they will
have to be replace with new studs having facto-
ry-applied thread sealant.
Removing Intake Manifold
Remove the genset enclosure and perform Steps1
through 4 of Removing Carburetor. (Do not loosen
the carburetor mounting nuts if the air filter, carbure-
tor and manifold are to be removed as an assem-
bly.) Then remove the intake manifold bolts and pull
away the assembly.
Reassembly
Reassembly is the reverse of disassembly. Always
use new gaskets when reassembling. Note the
marking on the gasket between the air filter enclo-
sure and the carburetor as to which way is up and
which side is out.
Torque the intake manifold bolts to 19 lb-ft (26 N-m).
If a carburetor through stud came out, replace it with
a new stud having factory-applied thread sealant.
Clean the threads in the manifold of the old sealant.
Torque the stud to 5.5 lb-ft (7 N-m).
Make sure the air intake fits through the opening in
the base and that the engine breather tube is con-
nected between the air filter enclosure and the cylin-
der head. To prevent damage to the air filter enclo-
sure, first tighten the two (2) carburetor mounting
nuts (left first) to 4.5 lb-ft (6 N-m) and then tighten
the two (2) support screws.
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