4. FUEL SYSTEM
TROUBLESHOOTING
Engine cranks but won’t start Engine lacks power
• No fuel in tank • Clogged air cleaner
• No fuel to carburetor • Faulty carburetor
• Cylinder flooded with fuel • Faulty ignition system
• No spark at plug
• Clogged air cleaner Lean mixture
• Intake air leak • Clogged carburetor fuel jets
• Improper throttle operation • Float level too low
• Intake air leak
Engine idles roughly, stalls or runs poorly • Faulty charcoal canister
• Excessively used choke • Restricted fuel line
• Ignition malfunction
• Faulty carburetor Rich mixture
• Poor quality fuel • Float level too low
• Lean or rich mixture • Clogged air jets
• Clogged air cleaner • Clogged air cleaner
• Incorrect idle speed • Restricted A.C.V. tube
• Faulty charcoal canister • Worn throttle needle
Misfiring during acceleration
• Faulty ignition system
• Faulty carburetor
• Faulty accelerating pump
• Faulty charcoal canister
Backfiring at deceleration
• Float level too low
• Incorrectly adjusted carburetor
• Faulty A.C.V.
• Faulty exhaust muffler
• Faulty A.I.C.V.
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