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SECTION 6A
FUEL SYSTEMS AND GOVERNORS
Outlet
Camshaft
Check
Valve
Fuel Pump
Lever
Inlet
Figure 6A-3.
Mechanical Fuel Pump.
Removal
1, Disconnect the fuel lines from the inlet and outlet
fittings of pump.
2. Remove the truss head nylock screws, fuel pump,
and gasket.
3. If necessary, remove the fittings from pump body.
Repair
Nylon-bodied fuel pumps are not serviceable and
must be replaced when faulty. Replacement pumps
are available in kits which include the pump and
mounting gasket.
Installation
(Refer to Figure 6A-4.)
Fittings
«25
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Truss Head
Nylock Screws
Figure 6A-4.
Installing Fuel Pump.
1. Fittings - Apply a small amount of Permatex® Avi-
ation Perm-A-Gasket (or equivalent) gasoline re-
sistant thread sealant to fittings. Tum fittings into
pump 6 full turns; continue tuming fittings in same
direction until desired position is reached.
2. Install new gasket, fuel pump, and truss head ny-
Jock screws.
NOTE:
Make sure the fuel pump lever is posi-
tioned above the camshaft.
Damage to
the fuel pump, and subsequent severe
engine damage could result if the lever is
positloned below the camshaft.
Torque screws to 40/45 In. Ib.
3. Connect fuel lines to inlet and outlet fittings.
CARBURETOR
This subsection covers the adjustment, disassembly,
cleaning, inspection, repair, and reassembly of
Kohler-buitt, side draft, adjustable Jet carburetors. n
A
WARNING:
Explosive Fuell
Gasoline may be present in the carburetor and fuel
system. Gasoline is extremely flammable and its va-
pors can explode if ignited. Keep sparks, open flame
and other sources of ignition away from engine,
Wipe up spilled fuel immediately.
Adjustment
The carburetor is designed to deliver the correct fuel/
air mixture to the engine under all operating condi-
tions. Carburetors are set at the factory and normally
do not need adjustment. If the engine exhibits condi-
tions like those found in the table on page 6A.4, it
may be necessary to adjust the carburetor.
Tuming the adjusting needles In (clockwise) de-
creases the supply of fuel to the carburetor. This
gives a leaner fuel/air mixture. Turning the adjusting
needles out (counterclockwise) increases the supply
of fuel to the carburetor.
This gives a richer fuel/air
mixture. Refer to Figures 6A-5 and 6A-8.
NOTE:
Incorrect settings can cause a fouled spark
plug, overheating, excessive valve wear, and
other problems. To ensure correct settings,
make sure the following
adjustment procedures are used.
Make carburetor adjustments after the engine
has warmed.
6A.3
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