Okay so you either have a bad governor cover or something badly wrong with the pump internally like a sheared pump shaft. If it was air you'd have been up and running by now. Here's how you might can get by cheap on this. Go to the boneyard and pull the governor cover off of any 5.7, 6.2, 6.9 or 7.3( I believe they will all work) if you find a 6.9 or 7.3 grab the whole pump if its cheap. It's also good practice. Yes this can easily be done in a parking lot. The worst part is getting the mounting bolts that mount the injection pump to the timing gear cover. You need the following tools 1) a 9/16 box end wrench, preferably ground down and bent as per Biofarmer93's article, but if you're patient most box end wrenches will work. I also remove the fast idle solenoid and throttle springs to gain easier access to the bottom nut on the timing gear cover. Do not remove the timing gear cover. You need to remove the oil fill spout. Behind it you'll find 3 5/16 or 8mm(interchangeable) 12 point bolts. I've pulled them with a variety of 5/16 and 8mm box wrenches and sockets, all work, but they must be 12 pt. You'll also need a 5/16 box wrench preferably with a 1" box wrench to use as a backup wrench. Write back and let us know how it goes.