Doosan G430 LP Service Manual page 39

Problem
Won't Run Continuously
Accelerate/Hesitation
During Acceleration
Engine Stalls
LP Engine G430 (3.0L)
Probable Cause
Faulty vapor connection
between pressure regulator
and carburetor
Throttle butterfly not opening
Incorrect full load air/fuel duty
Engine Mechanical
Idle duty cycle too high
(above 50%)
Fuel container almost empty
Excess flow valve closed
Clogged fuel filter
Plugged fuel line
Faulty vapor connectionr
between pressure regulator
and carburetor
Vacuum leak
Fuel lock malfunction
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Probable Solution
Check connection
No holes in hose
Clamps must be tight
Watch for kinked and/or pinched and/or
collapsed hose
Verify wide open throttle
Verify full load air/fuel duty cycle
cycle
See Troubleshooting section
Correct/adjust hardware failure
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 for vacuum leaks
Between carburetor and intake manifold
Between intake manifold and cylinder head
Check circuit wiring
Check safety switch
Check fuelock
Repair/replace fuelock as required
Troubleshooting