Possible Cause

Possible Remedy

Improper fuel (gasoline) in tank

Drain tank, flush system, fill with proper fuel

Air in the fuel system

Bleed fuel system, eliminate air leaks

Injection lines blocked or restricted

Drill to nominal I.D. or replace

Pump-to-engine timing incorrect

Readjust timing

Injection nozzle defective

Replace or repair

Engine air filter blocked

Replace air filter element

Injection sequence does not correspond to firing order

Install fuel injection lines in the correct order

Cold start device malfunction

Check cold start mechanism

Low or uneven engine compression

Repair as necessary

Fuel injection pump defective or cannot be adjusted

Remove pump and service