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G420E/G424E Tier LP Engine Basic Troubleshooting 41

Problem Probable Cause Corrective Action

Fuel Lock-off malfunction Repair/replace Fuel Lock-off

z See Chapter 3 Fuel Lock-Off

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

Pressure regulator freezes Check level in cooling system

z Must be full, check coolant strength

z -35F minimum

z Check coolant hoses

z Watch for kinks and/or pinched hoses

z Verify one pressure hose and one return

hose

Pressure regulator malfunction Test pressure regulator operation

z See Chapter 9 Tests and Adjustments

Vacuum leak Check for vacuum leaks

z Between mixer and throttle body

z Between throttle body and intake

manifold

z Between intake manifold and cylinder

head

Air/Fuel Mixer malfunction Check mixer

z See Chapter 8 Air/Fuel mixer section

Engine Stalls

Engine Mechanical See Engine Manufacturers Service Manual