Based on your statement that the engine ran a few weeks ago per the previous owner, here is my list. Some of this has already been said.

Make sure the supply and return fuel lines are hooked up correctly.
Make sure the linkage functions so the IP is at the idle stop position.
Disconnect the vacuum line to the back of the IP. leave it off.
Crack an injector to see if fuel comes out when cranking.
Check if glow system is working and check each plug to see if they all work.
Check valve adjustment.
Remove air filter. Leave it off.
Check for fungus in tank by seeing if hand pump creates a vacuum.

Additionally IP failure rate is very low and you don't need to worry about vacuum lines right now. You can disconnect them all. They have nothing to do with the engine. They are there to make the transmission and EGR work. Diesels don't depend on vacuum. You can correct them later when the engine is running.

Good luck,
Peter

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