G424 Service Manual Adjustment and Troubleshooting180
Problem Probable Cause Probable Solution
Will Not Start/FCV Fuel container empty Fill fuel container
Staying On • Do not exceed 80% of liquid capacity.
Liquid valve closed Open liquid valve slowly
Excess flow valve closed Reset excess flow valve
• Close liquid valve
• Wait for click sound
• Open valve slowly
Plugged fuel line Remove obstruction from fuel line
• Close liquid fuel valve
• Using caution, disconnect fuel line
• Clear obstruction with compressed air
• Re-connect fuel line
• Leak test
Clogged fuel filter Repair/replace as required
• Close liquid fuel valve
• Using caution, disconnect fuel line
• Remove/replace filter element
• Clean fuel filter housing
• Open liquid fuel valve
• Leak test
Faulty vapor connection Check connection
between pressure regulator • No holes in hose
and carburetor • Clamps must be tight
• Watch for kinked and/or pinched
and/or collapsed hose
Fuel lock malfunction • Check circuit wiring
• Check safety switch
• Check fuelock
• Repair/replace fuelock as required
Pressure regulator Test pressure regulator operation
malfunction • Use test kit
• Install primary pressure gauge
• Install secondary pressure gauge
• Crank engine and observe readings
on pressure gauges
• Compare readings to specifications
• If readings are out of spec
repair/replace pressure regulator
Will Not Start/FCV Carburetor malfunction Check carburetor
Staying On •Remove air/gas valve assembly
• Clean air/gas valve and carb throat
• Check diaphragm for holes/damage
• Check air/gas valve for wear/damage
• Repair/replace as required
Air filter plugged Check air filter
• Clean/replace as required
No spark Check for spark
• See, lgnition system sectiom
• Repair/replace as required
Engine Mechanical See Troubleshooting section
LP Fuel System (Standard and/or Low Emission Version)
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