4. FUEL SYSTEM
4-4
Trouble Diagnosis
Poor engine start
yNo fuel in fuel tank
yClogged fuel tube
yToo much fuel in cylinder
yNo spark from spark plug(malfunction of ignition
system )
yClogged air cleaner
yMalfunction of carburetor chock
yMalfunction of throttle operation
Stall after started
yMalfunction of carburetor chock
yIncorrect ignition timing
yMalfunction of carburetor
yDirty engine oil
yAir existing in intake system
yIncorrect idle speed
Rough idle
yMalfunction of ignition system
yIncorrect idle speed
yMalfunction of carburetor
yDirty fuel
Intermittently misfire as acceleration
yMalfunction of ignition system
Late ignition timing
yMalfunction of ignition system
yMalfunction of carburetor
Power insufficiency and fuel consuming
yFuel system clogged
yMalfunction of ignition system
Mixture too lean
yClogged fuel injector
yVacuum piston stick and closed
yMalfunction of float valve
yFuel level too low in float chamber
yClogged fuel tank cap vent
yClogged fuel filter
yObstructed fuel pipe
yClogged air vent hose
yAir existing in intake system
Mixture too rich
yClogged air injector
yMalfunction of float valve
yFuel level too high in float chamber
yMalfunction of carburetor chock
yDirty air cleaner
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