Doosan G430 LP Service Manual page 38

Problem
Won't Run Continuously
Won't
Accelerate/Hesitation
During Acceleration
LP Engine G430 (3.0L)
Probable Cause
Fuel container almost empty
Excess flow valve closed
Clogged fuel filter
Plugged fuel line
Faulty vapor connection
between pressure regulator
and carburetor
Pressure regulator freezes
Incorrect idle speed
Engine Mechanical
Fuel container almost empty
Excess flow valve closed
Clogged fuel filter
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Probable Solution
LPG vapor from liquid outlet
Fill fuel container
Do not exceed 80% of liquid capacity
Reset excess flow valve
Close liquid valve
Wait for click sound
Open valve slowly
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
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
Check connection
No holes in hose
Clamps must be tight
Watch for kinked and/or pinched
and/or collapsed hose
Check level in cooling system
Must be full
Check coolant strength
-35F minimum
Check coolant hoses
Watch for kinks and/or pinched hoses
Verify one pressure hose and one return
hose
Check idle speed
Adjust idle speed to specification
See Troubleshooting section
LPG vapor from liquid outlet
Fill fuel container
Do not exceed 80% of liquid capacity
Reset excess flow valve
Close liquid valve
Wait for click sound
Open valve slowly
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
Troubleshooting