Possible Cause

Possible Remedy

Improper fuel (gasoline) in tank

Drain tank, flush system, fill with proper fuel

Tank empty or tank vent blocked

Fill tank/bleed system, check tank vent

Air in the fuel system

Bleed fuel system, eliminate air leaks

Voltage supply malfunction/stop solenoid defective

Correct electrical faults/replace stop solenoid

Fuel filter blocked

Replace fuel filter

Injection lines blocked/restricted

Drill to nominal I.D. or replace

Fuel-supply lines blocked-resticted

Test all fuel supply lines - flush or replace

Loose connections, injection lines leak or broken

Tighten the connection, eliminate the leak

Paraffin deposit in fuel filter

Replace filter, use winter fuel

Pump-to-engine timing incorrect

Readjust timing

Pre-heating system defective

Test the glow plugs, replace as necessary

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