red side

Poor performance or black smoke

Poor Performance or Black Smoke

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


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