Fuel System Troubleshooting
Engine cranks but won't startEdit
- No fuel to carburetor
- Engine flooded with fuel
- No spark at plug (ignition system faulty)
- Clogged air cleaner
- Intake air leak
- Improper choke operation
- Improper throttle operation
Engine idles roughly, runs poorly or stallsEdit
- Improper choke operation
- Ignition malfunction
- Fuel contaminated
- Intake air leak
- Incorrect idle speed
- Incorrect pilot screw adjustment
- Low cylinder compression
- Choke stuck open
- Rich mixture
- Lean mixture
- Clogged carburetor
Misfiring during accelerationEdit
- Ignition system faulty
- Lean mixture
Afterburn during accelerationEdit
- Ignition system faulty
- Lean mixture
Poor performance (driveability) and poor fuel economyEdit
- Fuel system clogged
- Ignition system faulty
- Air cleaner clogged
AfterfiringEdit
- Ignition system malfunction
- Carburetor malfunction
- Lean mixture
- Rich mixture
Lean mixtureEdit
- Clogged fuel jets
- Faulty float valve
- Float level too low
- Blocked fuel fill cap air vent hole
- Clogged fuel strainer screen
- Restricted fuel line
- Clogged air vent tube
- Intake air leak
Rich mixtureEdit
- Clogged air cleaner
- Worn jet or needle jet
- Faulty float valve
- Float level too high
- Choke stuck open
Incorrect fast idle speedEdit