When I replaced my primary fuel filter, I pumped then priming pump lever for a few minutes but no fuel ever came up through the bleeding screw. I assumed that maybe the little lever did not do anything, tighten the bleeding screw. As suspected, the engine started and soon died because of air in the fuel line. I then cracked the injectors and ran the starter while pulling the stop button. Again, no fuel came out of injectors. So, I tighten the injectors back up and tried to start the engine at full throttle. Somehow it did start and ran very roughly before dying again. I repeated the process a few times and finally, it ran fine. I can only assume that there is some kind of self-bleeding with the 3GMF but I'd like to know why no fuel came out of the bleeding screw..