Possible Cause

Possible Remedy

Air in fuel system

Bleed fuel system, eliminate air leaks

Tank empty or tank vent blocked

Fill tank/bleed system, check tank vent

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, elimate the leak

Paraffin deposit in fuel filter

Replace filter, use winter fuel

Pump-to-engine timing incorrect

Readjust timing

Injection nozzle defective

Repair or replace

Overflow valve defective or blocked

Clean the orifice or replace fitting

Fuel injection pump defective or cannot be adjusted

Remove pump and service