5.3
Section 5
Fuel System and Governor
5
Figure 5-1. Pulse Fuel Pump.
Carburetor
These engines are equipped with a Walbro fixed main
jet carburetor. See Figure 5-2. The carburetors will
have a low idle speed adjustment screw, and either
fixed idle, or a limiter cap on the idle fuel adjustment
needle.
Troubleshooting – Fuel System
If engine troubles are experienced that appear to be
fuel system related, check the following areas before
adjusting or disassembling the carburetor.
• Make sure the fuel tank is filled with clean, fresh
gasoline.
• Make sure the fuel cap vent is not blocked and
that it is operating properly.
• Make sure fuel is reaching the carburetor. This
includes checking the fuel shut-off valve, fuel tank
filter screen, in-line fuel filter, fuel lines, and fuel
pump (as equipped), for restrictions or faulty
components.
• Make sure the air cleaner base and carburetor
are securely fastened to the engine using gaskets
in good condition.
• Make sure the air cleaner element is clean, and
all air cleaner components are fastened securely.
• Make sure the ignition system, governor system,
exhaust system, and throttle and choke controls
are operating properly.
If, after checking the items listed above, starting
problems or conditions similar to those listed in the
following table exist, it may be necessary to adjust or
service the carburetor.
Figure 5-2. Carburetor.
WARNING: Explosive Fuel
Gasoline is extremely flammable and its vapors can
explode if ignited. Store gasoline only in approved
containers, in well ventilated, unoccupied buildings,
away from sparks or flames. Do not fill the fuel tank
while the engine is hot or running, since spilled fuel
could ignite if it comes in contact with hot parts or
sparks from ignition. Do not start the engine near
spilled fuel. Never use gasoline as a cleaning agent.
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