Doosan D20S-5 Operation & Maintenance Manual page 96

Operation Section Operation Section
Problem Problem
Difficult to Start Difficult to Start
(Gas) (Gas)
Will Not Run Will Not Run
Continuously Continuously
(Gas) (Gas)
Probable Cause Probable Cause
Fuel tank Fuel tank almost almost empty empty
Clogged fuel Clogged fuel filter filter
Electric Fuel Pump malfunction Electric Fuel Pump malfunction
(GAS) (GAS)
Pressure regulator Pressure regulator malfunction malfunction
Fuel Injector Fuel Injector malfunction malfunction
Air filter Air filter clogged clogged
Incorrect Incorrect air/fuel air/fuel or or ignition ignition control
Engine Mechanical Engine Mechanical
Isolate the gasoline system by Isolate the gasoline system by
running the lift truck on LPG running the lift truck on LPG
Fuel Fuel tank tank almost almost empty empty
Clogged Clogged fuel fuel filter filter
-93- -93-
Corrective Action Corrective
Fuel Pump Fuel Pump Cavitations Cavitations
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 GAS Fuel select switch is not on
 
Repair/replace Repair/replace as
See Maintenance section, Primary and See Maintenance section, Primary and
 
Secondary Fuel Filter re Secondary Fuel Filter replacement
Check electrical connection Check electrical connection
Check Relay and fuse Turn key ON Check Relay and fuse Turn key ON
 
and verify pump is operating and verify pump is operating
See Engine Service Manual See Engine Service Manual
 
Test pressure Test pressure regulator
See Engine Service Manual See Engine Service Manual
 
Test Test Injector Injector operation operation
See Engine Service Manual See Engine Service Manual
 
Check air Check air filter filter
Clean/replace as required Clean/replace as required
 
control See Advanced See Advanced Diagnostics
See See Engine Engine Service Service Manual
Verify LPG cylinder is full and valve is open. Verify LPG cylinder is full and valve is open.
If the problem does not exist in LPG mode If the problem does not exist in LPG mode
proceed with the corrective action steps proceed with the corrective action steps
below. below.
If the problem If the problem also exists in LPG mode then
the root cause is most likely to be the root cause is most likely to be
something other than the fuel system something other than the fuel system
See Advanced Diagnostics See Advanced Diagnostics
 
Fuel Fuel Pump Pump Cavitations Cavitations
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
Repair/replace as Repair/replace
See Maintenance section, Primary and See Maintenance section, Primary and
 
Secondary Fuel Filter replacement Secondary Fuel Filter re
Action
GAS
as required required
placement
regulator operation operation
Diagnostics
Manual
also exists in LPG mode then
as required required
placement