Doosan D20S-5 Operation & Maintenance Manual page 97

Problem Problem
Will Not Run Will Not Run
Continuously Continuously
(Gas) (Gas)
Will Not Will Not
Accelerate/Hesita Accelerate/Hesita
tion During tion During
Acceleration or Acceleration or
Engine Stalls Engine Stalls
(Gas) (Gas)
Probable Cause Probable Cause
Electric Fuel Pump malfunction Electric Fuel Pump malfunction
(GAS) (GAS)
Pressure regulator Pressure regulator malfunction malfunction
Fuel Fuel Injector Injector malfunction malfunction
Incorrect idle speed or ignition Incorrect idle speed or ignition
problem problem
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
Pressure Pressure regulator regulator malfunction malfunction
Fuel Fuel Injector Injector malfunction malfunction
-94- -94-
Corrective Action Corrective
Check electrical connection Check electrical connection
Check Relay and fuse Turn key ON Check Relay and fuse Turn key ON
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and verify pump is operating and verify pump is operating
See Engine Service Manual See Engine Service Manual
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Test Test pressure pressure regulator
See Engine Service Manual See Engine Service Manual
 
Test Test Injector Injector operation operation
See Engine Service Manual See Engine Service Manual
 
See Advanced Diagnostics 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 also exists in LPG mode then If the problem
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
Test pressure Test pressure regulator
See Engine Service Manual See Engine Service Manual
 
Test Test Injector Injector operation operation
Operation Section Operation Section
Action
regulator operation operation
Manual
also exists in LPG mode then
as required required
placement
regulator operation operation