Some guys will tell you to crack the injector lines, but I had some trouble doing this, I ruined the threads on an injector and had trouble with a return line, luckily I had extra parts. I just stick to the schrader valve on the filter housing, just put a rag under it to catch the diesel, loosen the valve core in the valve and start cranking! It will take a little while, when it starts tighten up the valve core and your done. You may have to bleed it more than you think. Good luck!