General Troubleshooting 4-7TP-5648 8/93
Will not Fuel line restriction Inspect fuel lines and
carry load tank.
or runs
rough Vent in fuel tank cap Clean cap in solvent, blow
(cont’d.) obstructed dry
Dirty fuel filter Replace fuel filter Section 3. Fuel System
Improper type of fuel Use proper type of fuel; Section 3. Fuel System
consult fuel supplier
Water, dirt, or air in fuel Drain, fill, and Section 3. Fuel System
system bleed air in the system
Replace fuel filters
Defective fuel Check fuel pump Engine Service Manual
pump NOTE:
Fuel pump is polarity
sensitive and will fail
if the lead connections
are made in reverse
(Black lead is positive,
White/Black lead is negative)
Fuel leak Tighten fittings Engine Service Manual
Valves not sealing Compression test Engine Service Manual
Air cleaner clogged Clean or replace Section 3. Air Cleaner
element Service
Incorrect fuel injection Check injection timing Engine Service Manual
timing
Dirty or faulty injectors Check injectors Engine Service Manual
Improper cylinder top Check clearance Engine Service Manual
clearance
Defective piston or Check compression Engine Service Manual
piston rings
Defective crankshaft Check components Engine Service Manual
bearing or piston pin
bearing
Improper valve Adjust proper valve Engine Service Manual
clearance clearance
Problem Possible Cause Corrective Action Reference
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