Doosan D20S-5 Operation & Maintenance Manual page 101

Problem
Difficult to Start
(Gas)
Will Not Run
Continuously
(Gas)
Probable Cause
Fuel tank almost empty
Clogged fuel filter
Electric Fuel Pump malfunction
(GAS)
Pressure regulator malfunction
Fuel Injector malfunction
Air filter clogged
Incorrect air/fuel or ignition control
Engine Mechanical
Isolate the gasoline system by
running the lift truck on LPG
Fuel tank almost empty
Clogged fuel filter
Corrective Action
Fuel Pump Cavitations
The tank should be at least ¼ full to
properly prime the fuel pump
Fuel select switch is not on GAS
Repair/replace as required
See Maintenance section, Primary and
Secondary Fuel Filter replacement
Check electrical connection
Check Relay and fuse Turn key ON
and verify pump is operating
See Engine Service Manual
Test pressure regulator operation
See Engine Service Manual
Test Injector operation
See Engine Service Manual
Check air filter
Clean/replace as required
See Advanced Diagnostics
See Engine Service Manual
Verify LPG cylinder is full and valve is open.
If the problem does not exist in LPG mode
proceed with the corrective action steps
below.
If the problem also exists in LPG mode then
the root cause is most likely to be
something other than the fuel system
See Advanced Diagnostics
Fuel Pump Cavitations
The tank should be at least ¼ full to
properly prime the fuel pump
Repair/replace as required
See Maintenance section, Primary and
Secondary Fuel Filter replacement
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Operation Section