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M18 & M20
SECTION 6A
FUEL SYSTEMS AND GOVERNORS
FUEL SYSTEM
The typical fuel system and related components in-
clude the fuel tank with vented cap, in-line fuel filter,
fuel pump, carburetor, and interconnecting fuel line.
Refer to Figure 6A-1.
Kohler-built carburetors are dis-
cussed in this section plus Dual Fuel System. Walbro
Carburetors are covered in Section 6B.
Operation
The fuel from the tank is moved through the in-line
filter, and fuel tines by the fuel pump. Fuel then enters
the carburetor float bow! and is moved into the carbu-
retor body where it is mixed with air. This fuel-air mix-
ture is then burned in the engine combustion
chambers.
Fuel Tank
(Equipment or
Remote Mounted)
Fuel Line
Vented Fuel
Tank Cap
^S Fuel Pickup Tube
With Screen
In-line
Fuel Filter
Troubleshooting
Use the following procedure to check if fuel is reach-
ing the combustion chamber.
A
WARNING:
Explosive Fuel!
Gasoline is extremely flammable and its vapors can
explode if ignited. Before troubleshooting the fuel
system, make sure there are no sources of heat,
flames, or sparks nearby as these can ignite gaso-
line vapors.
Disconnect and ground the spark plug
leads to eliminate the possibility of sparks from the
ignition system.
Intake Manifold
(To Combustion Chambers)
Carburetor
Fuel Line
Fuel Line
Camshaft
Figure 6A-1. Typical Fuel System.
$A.1
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