Doosan D50S-5 Operation & Maintenance Manual page 85

section. Items such section. Items such as
clogged fuel filters and malfunctioning pressure clogged fuel filters and malfunctioning pressure
regulators may not set a fault code by the Small regulators may not set a fault code by the Small
Engine Control Engine Control Module
Problem Problem
Engine Engine
but Will Not Start but Will Not Start
Problem Problem
Engine Engine
but Will Not Start but Will Not Start
as fuel fuel level, level, plugged plugged fuel lines,
Module (SECM). (SECM). Below Below are b
Probable le Cause Probab
Cranking Cranking
Fuel Fuel container container empty
Liquid Liquid valve valve closed
Excess Excess flow flow valve
Plugged fuel Plugged fuel line
Broken Broken Fuse Fuse - - SECM
Clogged fuel Clogged fuel filter
Faulty vapor connection between Faulty vapor connection between
the pressure regulator/converter the pressure regulator/converter
and the mixer and the mixer
Fuel Fuel Lock-off Lock-off malfunction
Pressure Pressure
malfunction malfunction
Incorrect air/fuel or ignition/spark Incorrect air/fuel or ignition/spark
control control
Probable le Cause Probab
Cranking Cranking
No No VR VR Sensor Sensor Signal
fuel lines, exactly the same way as with a gasoline engine. exactly the same way as with a gasoline engine.
Consider all parts of the ignition and mechanical Consider all parts of the ignition and mechanical
systems as well as the fuel system. systems as well as the fuel system.
are basic asic
Cause
empty Fill Fill fuel
closed Slowly Slowly open
valve closed closed Reset excess Reset
line Remove Remove obstruction
SECM Replace Fuse Replace
filter Repair/replace Repair/replace as
Check connection Check connection
malfunction Repair/replace Fuel Repair/replace
regulator/converter regulator/converter Test pressure regulator/converter operation Test pressure regulator/converter operation
See Advanced Diagnostics See Advanced Diagnostics
84 84
Cause
Signal Verify the Verify
Corrective Action Corrective Action
fuel container container
Do not exceed 80% of liquid Do not exceed 80% of liquid
 
capacity capacity
open liquid liquid valve valve
excess flow flow valve valve
Close liquid valve Close liquid valve
 
Wait for a "click" sound Wait for a "click" sound
 
Slowly open liquid valv Slowly open liquid valve e
 
obstruction from from the the fuel
Close liquid fuel valve Close liquid fuel valve
 
Using caution, disconnect the fuel Using caution, disconnect the fuel
 
line (some propane may escape) line (some propane may escape)
Clear obstruction with compressed Clear obstruction with compressed
 
air air
Re-connect fuel line Re-connect fuel line
 
Slowly open liquid fuel valve Slowly open liquid fuel valve
 
Leak test Leak test
 
Fuse for for SECM SECM
See Maintenance Section, Fuses See Maintenance Section, Fuses
 
replacement replacement
as required required
See Maintenance Section, LP Fuel See Maintenance Section, LP Fuel
 
Filter replacement Filter replacement
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
Fuel Lock-off Lock-off
See Engine Service Manual See Engine Service Manual
 
See Engine Service Manual See Engine Service Manual
 
Operation Section Operation Section
Corrective Corrective Action Action
the VR VR signal signal is is present present
See Advanced Diagnostics See Advanced Diagnostics
 
fuel line line