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
