Doosan D20S-5 Operation & Maintenance Manual page 95

Basic Troubleshooting (Gasoline) Basic Troubleshooting (Gasoline)
Problem Problem
Engine Cranking Engine Cranking
but Will Not Start but Will Not Start
(Gas) (Gas)
Probable Cause Probable Cause
Fuel tank Fuel tank empty empty
Clogged fuel Clogged fuel filter filter
Faulty vapor connection between Faulty vapor connection between
the pressure regulator/ converter the pressure regulator/ converter
and the mixer (LPG) and the mixer (LPG)
Electric Fuel Pump malfunction Electric Fuel Pump malfunction
(GAS) (GAS)
Fuel Fuel Pressure Pressure regulator regulator malfunction malfunction
Fuel Fuel Injector Injector malfunction malfunction
Incorrect air/fuel or ignition/ spark Incorrect air/fuel or ignition/ spark
control control
No No VR VR Sensor Sensor Signal Signal
-92- -92-
Corrective Action Corrective
Fill fuel Fill fuel container container
The tank should be at least ¼ full to The tank should be at least ¼ full to
 
properly prime the fuel pump. properly prime the fuel pump.
  Fuel select switch is not on Fuel select switch is not on GAS
Repair/replace Repair/replace as
See See Maintenance Maintenance section
 
and Secondary Fuel Filter replacement and Secondary 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 Look for for
 
collapsed hose collapsed hose
Check electrical connection Check electrical connection
Check Relay and fuse Check Relay and fuse
 
Turn key ON and verify pump is operating Turn key ON and verify pump is operating
Test pressure Test pressure regulator
See Engine Service Manual See Engine Service Manual
 
Test Injector Test Injector operation operation
See Engine Service Manual See Engine Service Manual
 
See Advanced Diagnostics See Advanced Diagnostics
Verify the Verify the VR VR signal
See Advanced Diagnostics See Advanced Diagnostics
 
Operation Section Operation Section
Action
GAS
as required required
section Primary Primary
kinked, kinked, pinched pinched and/or and/or
regulator operation operation
signal is is present present