If a marine diesel engine suddenly dies due to running out of fuel or after replacing a fuel filter element, why will it fail to restart, and what procedure is required?

1. Air has entered the fuel lines and high-pressure injection system, preventing fuel compression; the system must be bled of air (purgado) using the primer pump and bleed screws
2. The starter motor must be replaced with a higher voltage unit
3. The propeller must be rotated backward by hand for 50 revolutions
4. The engine oil must be drained and replaced with hydraulic fluid