NMC-WOLLARD 2021Truax Blvd., Eau Claire, WI 54703, Phone (715) 835-3151, Fax (715) 835-6625
M100 Tow Tractor Manual No. 46052
PAGE 11
CHAPTER 2 MAINTENANCE
2 TROUBLESHOOTING
AUGUST 31, 2008
2.6 OPTIONAL LPG FUEL SYSTEM
Most engine problems are not related to the fuel systems. To isolate the fuel
system:
• Check ignition coil, plugs, wires, ignition timing and dwell, as applicable.
• Check radiator coolant level, hoses, and thermostat.
• Check governed RPM.
• Check throttle travel. At full throttle opening, there must be 1/32” clearance
between throttle stop pin and stop screw.
• Check PCV valve, if installed.
2.6.1 LPG System Trouble Shooting
PROBLEM POSSIBLE CAUSE
Engine Won’t Start
Low or no fuel in tank.
Vacuum line loose, pinched, or plugged.
Hard Starting
Secondary valve in vaporizer/regulator sticking Disassemble
and clean or install rebuild kit.
Erratic Idle
Primary valve in vaporizer/regulator defective.
Disassemble and install rebuild kit.
Lack of Power
Withdrawal valve (10%) closed
Tank low on fuel (pulling vapor only)
Low vacuum in system.
See problem Frost, Ice, or Moisture on Vaporizer Regulator.
“Hunts” at Governed RPM
Disassemble and install rebuild kit.
Secondary valve in vaporizer-regulator dirty and sticking.
Disassemble and clean or install rebuild kit.
Frost, Ice, or Moisture on
Withdrawal valve (10%) closed.
Frost, Ice, or Moisture on
Vaporizer/Regulator
(I.e., Frozen Converter)
Vaporizer water hoses improperly connected.
Radiator low on water.
Faulty cooling system (Defective water pump, thermostat, fan
belt, or hoses)
converter).
Improperly routed water hoses.
Primary valve seat in vaporizer/regulator not seating.
Faulty head gasket allowing air on compression to escape
into water system. This causes air pocket in converter water
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