If after doing everything oldbull said, you still cant get it to cough, Ive run into many diesels that just dont want to bleed off by themselves for some reason or another, even when they have electric pusher pumps , and I found this nifty test rig works wonders for priming them up, especially if the ip has been bone dry.
Get a boat gas tank like used for outboards, and a long length of 3/8 fuel line with the boat hand primer bulb and an inline fuel filter and assemble that setup , fill the tank with diesel and attach the hose directly to the metal line going to the IP place teh tank on the roof so it will gravity feed once it gets going. crack the injector lines open and then have someone crank the engine withthe throttle flat on the floor while you squeeze that hand primer bulb like a maniac. you will be surprised how much pressure you can put to that thing, it turns out to be more than your fuel pump, that little hand bulb really shoves fuel through the IP, and when you have a stubborn air locked injection pump, it can be the only way to get it sometimes. When you start seeing fuel at injectors stop and tighten them down the crank and pump some more till you see more fuel etc. Dont crank too long at a time, dont want to fry your starter