I'm not familiar with the machine or the engine but with a diesel you don't have and ignition system to contend with so the logical place to start is to determine if there is power to the fuel solenoid. First check any and all fuses and then check the wiring from the ignition to the fuel solenoid. If you put your hand on the solenoid you should be able to hear of feel it open when the ignition is on. If you don't then look for loose or broken wires. You may be able to verify that the solenoid is OK by running a temp jumper wire from the solenoid to the battery. If that don't work then it's summin else and I can't help you.
Phil
+1 I've seen this several times. It is the price of the convenience of a diesel turning of with the switch.
Check the other things listed.
Then crack an injector and see if there is fuel to the injector. I have had fuel pump drive failures do the same thing.
Sometimes the fuel solenoid works erratically instead of going completely bad all at once.
I'm assuming you did prime the injectors after changing the filters? If the pump system or fuel shut off is bad you you wont be able to prime the system.
The most logical reason for a diesel to shut of suddenly and quietly is going to be lack of fuel.