Doosan D20S-5 Operation & Maintenance Manual page 91

Problem Problem
Will Not Will Not
Accelerate/Hesita Accelerate/Hesita
tion During tion During
Acceleration Acceleration
Engine Stalls Engine Stalls
Probable Cause Probable Cause
Clogged fuel Clogged fuel filter filter
Faulty vapor connection between Faulty vapor connection between
the the pressure pressure regulator/converter regulator/converter
and the mixer and the mixer
Throttle butterfly valve not opening Throttle butterfly valve not opening
or sticking or sticking
Foot Foot Pedal Pedal signal signal incorrect incorrect
intermittent intermittent
Incorrect air/fuel or ignition control Incorrect air/fuel or igni tion control
Engine Engine Mecha Mechanical nical
Fuel Fuel container container almost almost empty empty
Excess Excess flow flow valve valve closed closed
Clogged fuel Clogged fuel filter filter
Plugged fuel Plugged fuel line line
-88- -88-
Corrective Action Corrective
Repair/replace as Repair/replace
See Maintenance See Maintenance
 
Section, LP Fuel Filter replacement Section, LP Fuel Filter replacement
Check connection Check connection
Verify no holes in hose Verify no holes in hose
 
 
Clamps must be tight Clamps must be tight
Look for kinked, pinched and/or Look for kinked, pinched and/or
 
collapsed hose collapsed hose
See Advanced Diagnostics See Advanced Diagnostics
or or
See See Engine Engine Service Service Manual
LPG Vapor LPG Vapor from from liquid
Fill fuel container Fill fuel container
 
Do not exceed 80% of liquid Do not exceed 80% of liquid capacity
 
Reset excess Reset excess flow
Close liquid valve Close liquid valve
 
Wait for a "click" sound Wait for a "click" sound
 
Slowly open liquid valve Slowly open liquid valve
Repair/replace as Repair/replace
See Maintenance Section, LP Fuel See Maintenance Section, LP Fuel
 
Filter replacement Filter replacement
Remove obstruction Remove obstruction from
Close liquid fuel valve Close liquid fuel valve
 
Using caution, disconnect the fuel line Using caution, disconnect the fuel line
 
(some propane may escape) (some propane may escape)
Clear obstruction with compressed air Clear obstruction with compressed air
 
Re-connect fuel line Re-connect fuel line
 
Slowly open liquid fuel valve & Leak Slowly open liquid fuel valve & Leak
 
test test
Operation Section Operation Section
Action
as required required
Manual
liquid outlet outlet
capacity
flow valve valve
as required required
from the the fuel fuel line line