I take it it's a diesel yeah. Should still turn over even if the pump is different. Look for the black and red thickish (4/5mm) wire up by the battery with a connector on it this is the starter wire test it there to see if there's power when turning key to start if there is could be starter even try putting a live to it. It still could be recognising pump fault for lights. Worst case just wire this wire straight to the ignition (start position) and do the same to the pump, (but to ignition position) remove the metal security cover on the pump to expose the solenoid then replace it with the earlier type which just needs a live.