4-2
FUEL SYSTEM
TROUBLESHOOTING
Engine cranks but won't start
● No fuel in tank
● No fuel to carburetor
● Cylinder flooded with fuel
● Clogged air cleaner
● No spark at plug
Rough idle, incorrect idle speed
● Faulty idle adjustment
● Excessively lean or rich mixture
● Clogged fuel system
● Intake air leak
● Clogged fuel system
Lean mixture
● Clogged carburetor jets
● Clogged fuel tank breather
● Clogged fuel strainer screen
● Twisted, pressed and clogged fuel tube
● Faulty float valve
● Float level too low
Rich mixture
● Closed choke valve
● Faulty float vlave
● Float level too high
● Clogged air jets
Load during acceleration
● Faulty accelerating pump
4-2
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