Doosan D35C-5 FDA04 Operation & Maintenance Manual page 106

Operation Section
Problem
Engine Stalls
Rough Idle
Probable Cause
Fuel Lock-off malfunction
Faulty vapor connection between
the pressure regulator/converter
and the mixer
Pressure regulator freezes
Pressure regulator malfunction
Vacuum leak
Air/Fuel Mixer malfunction
Engine Mechanical
Faulty vapor connection between
the pressure regulator/converter
and the mixer
Pressure regulator malfunction
Vacuum leak
Air/Fuel Mixer malfunction
Repair/replace Fuel Lock-off
See Engine Service Manual

Check connection
Verify no holes in hose

Clamps must be tight

Look for kinked, pinched and/or

collapsed hose
Check level in cooling system
Must be full, check coolant strength

-35F minimum

Check coolant hoses

Watch for kinks and/or pinched hoses

Verify one pressure hose and one return

hose
Test pressure regulator operation
See Engine Service Manual

Check for vacuum leaks
Between mixer and throttle body

Between throttle body and intake

manifold
Between intake manifold and cylinder

head
Check mixer
See Engine Service Manual

See Engine Manufacturers Service Manual
Check connection
Verify no holes in hose

Clamps must be tight

Look for kinked, pinched and/or

collapsed hose
Test pressure regulator operation
See Engine Service Manual

Check for vacuum leaks
Between mixer and throttle body

Between throttle body and intake

manifold
Between intake manifold and cylinder

head
Check mixer
See Engine Service Manual

-104-
Corrective Action