G643(E) Service Manual
236
Chapter 7. Basic Troubleshooting
Engine Cranking but Will Not Start / Difficult to Start
Engine cranks OK, but does not start for a long time. Does eventually run, or may start but immediately dies.
Preliminary Checks
Perform the visual checks as described at start of “ Basic Troubleshooting” chapter.
Be sure driver is using correct method to start engine as explained in operator’s manual. Use “clear flood”
mode during cranking by fully depressing the pedal and cranking the engine. If engine does not start, continue
troubleshooting.
PROBABLE CAUSE
CORRECTIVE ACTION
CORRECTIVE ACTION
Verify “selected” fuel with Service Tool. Make sure fuel select switch
is in proper position.
Fuel container empty
Check for LPG vapor from LPG liquid outlet valve on tank.
Fill fuel container. Do not exceed 80% of liquid capacity.
Liquid valve closed
Slowly open liquid valve.
Propane excess flow
valve closed
Reset excess flow valve in LPG tank.
Close liquid valve. Wait for a “click” sound; slowly open liquid valve.
Plugged fuel line
Remove obstruction from the fuel line.
•
Close liquid fuel valve.
•
Using caution, disconnect the fuel line (some propane may
escape).
•
Clear obstruction with compressed air.
•
Re-connect fuel line.
•
Slowly open liquid fuel valve.
•
Leak test.
Clogged fuel filter
Repair/replace as required.
See Chapter 2 Fuel Filter replacement.
Faulty vapor connection between the
pressure regulator/converter and the
mixer
Check connection
•
Verify no holes in hose.
•
Clamps must be tight.
•
Look for kinked, pinched and/or collapsed hose.
Fuel lock-off malfunction
Repair/replace fuel lock-off.
See Chapter 5 Fuel Lock-off.
Pressure regulator/converter
malfunction
Test regulator/converter operation and pressure.
See Chapter 6 LPG Fuel Delivery System.
Incorrect air/fuel or ignition/spark
control
See Chapter 8 Advanced Diagnostics.
No crankshaft position sensor signal
Verify the crankshaft position signal is present
See Chapter 8 Advanced Diagnostics.
