Operation Section
-103-
Problem Probable Cause Corrective Action
Isolate the gasoline system by
running the lift truck on LPG
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 &
G424E/G430E Dual Fuel Engine Service
Manual
Clogged fuel filter Repair/replace as required
z See Maintenance section, Fuel
Filter replacement
Plugged fuel line Remove obstruction from the fuel line
z Close liquid fuel valve
z Using caution, disconnect the fuel
line (some propane may escape)
z Clear obstruction with compressed
air
z Re-connect fuel line
z Slowly open liquid fuel valve & Leak
test
Air filter clogged Check air filter
z Clean/replace as required
Faulty vapor connection between
the pressure regulator/converter
and the mixer
Check connection
z Verify no holes in hose
z Clamps must be tight
z Look for kinked, pinched and/or
collapsed hose
Poor High Speed
Performance
(Gas)
Pressure regulator malfunction Test pressure regulator operation
z See G424E/G430E Dual Fuel
Engine Service Manual
Problem Probable Cause Corrective Action
Air/Fuel Mixer malfunction Check mixer
z See G424E/G430E Engine Service
Manual
Restricted exhaust system Check exhaust system
z Measure exhaust back pressure
Incorrect ignition control
Incorrect air/fuel control
Poor High Speed
Performance
(Gas)
Incorrect throttle position
See Advanced Diagnostics &
G424E/G430E Dual Fuel Engine Service
Manual
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