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Faults and probable causes
Engine does not start / starter does not turn
Faults Solution
Circuit breaker is open or fuse has blown
Check and re-install the circuit breaker or replace the
fuse or replace the circuit breaker
Electrical circuit breaker is not working
Battery switch is open (battery main switch) Close the switch
Electrical connections are faulty
Check the electrical connections and wires (especially the
battery cables) Clean and tighten the connections
Battery faulty Test and charge or replace the battery if faulty
Starting procedure defective Read and implement the starting procedure
Fuel tank empty or fuel valve closed Fill the tank or open the valve
Fuel pump faulty Replace the pump
Fuel fi lters clogged or water present
Clean or replace the fuel fi lters or drain the water from the
prefi lter then drain the circuit
Fuel contaminated or too old Drain the tank if contaminated and fi ll with clean fuel
Fuel pipe or air pipe of tank blocked or bent
Replace the bent pipes or blow in compressed air to
remove the obstruction
Air present in fuel injection system Drain the injection system
Fault-fi nding
This section helps you to understand the different problems that may arise on your engine. The safest way to correct the
problems you may encounter, however, is to contact a qualifi ed Nanni Diesel dealer. Some operations must be carried out
by a qualifi ed Nanni Diesel authorised dealer. These operations are marked in bold in the tables below.
This non-exhaustive list serves as a tool in emergencies and should never be considered a repair procedure. Some of the
components listed may not be part of your engine.
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