G420E/G424E Tier LP Engine Basic Troubleshooting 38
Problem Probable Cause Corrective Action
Engine Cranking
but Will Not Start
No VR Sensor Signal Verify the VR signal is present
z See Chapter 5 Advanced Diagnostics
Fuel container almost empty LPG Vapor from liquid outlet
z Fill fuel container
z Do not exceed 80% of liquid capacity
Excess flow valve closed Reset excess flow valve
z Close liquid valve
z Wait for a “click” sound
Slowly open liquid valve
Clogged fuel filter Repair/replace as required
z See Chapter 3 Fuel Filter replacement
Plugged fuel line Remove obstruction from the fuel line
z Close liquid fuel valve
z Using caution, disconnect the fuel line
(some propane may escape)
z Clear obstruction with compressed air
z Re-connect fuel line
z Slowly open liquid fuel valve
z Leak test
Faulty vapor connection between
the pressure regulator/converter
and the mixer
Check connection
z Verify no holes in hose
z Clamps must be tight
z Look for kinked, pinched and/or
collapsed hose
Pressure regulator/converter
malfunction
Test pressure regulator/converter operation
z See Chapter 9 Tests and Adjustments
Fuel container almost empty LPG Vapor from liquid outlet
z Fill fuel container
z Do not exceed 80% of liquid capacity
Air filter clogged Check air filter
z Clean/replace as required
Incorrect air/fuel or ignition control See Chapter 5 Advanced Diagnostics
Difficult to Start
Engine Mechanical See Engine Manufacturers Service Manual
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