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FUEL SYSTEM
TROUBLESHOOTING
Engine won't to start
• No fuel in tank
• No fuel to carburetor
- Fuel filter clogged
- Fuel hose clogged
- Fuel tank breather hole clogged
- Fuel pump faulty (page 4-4)
• Too mach fuel getting to the engine
- Air cleaner clogged
- Flooded carburetor
• Intake air leak
• Fuel contaminated/deteriorated
• Faulty starting enrichment (SE) valve
• Clogged starting enrichment (SE) circuit
• Clogged carburetor slow circuit
• Improper throttle operation
• No spark at plug (faulty ignition system - page 16-5)
Engine stall, hard to start, rough idling
• Fuel line restricted
• Fuel mixture too lean/rich
• Fuel contaminated/deteriorated
• Intake air leak
• Idle speed misadjusted
• Pilot screw misadjusted
• Fuel tank breather hole clogged
• Air cleaner clogged
• Slow circuit clogged
• Faulty starting enrichment (SE) valve
• Fuel pump faulty (page 4-4)
• ECT sensor faultypipage 18-16)
• Ignition malfunction (page 16-5)
Lean mixture
• Fuel jets clogged
• Float valve faulty
• Float level too low
• Fuel line restricted
• Carburetor air vent hose clogged
• Blocked fuel fill cap air vent hole
• Intake air leak
• Vacuum piston faulty
• Fuel pump faulty (page 4-4)
Rich mixture
• Air jet clogged
• Float valve faulty
• Float level too high
• Starting enrichment (SE) valve stuck open
• Air cleaner element contaminated
• Flooded carburetor
Backfiring or misfiring during acceleration
• Fuel mixture too lean
• Ignition system malfunction (page 16-5)
Afterburn when engine braking is used
• Lean mixture in slow circuit
• Air cut-off valve malfunction
• Ignition malfunction (page 16-5)
5-5
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Table of Contents
Troubleshooting
