yes the injectors have O-rings but you dont have to remove the injectors. there are C shape clips holding in injectors do not touch these. just loosen the nut on the end of the feul pipe on the top of each injector. I think there 15mm. dnt take them right off just loosen them. then turn the car over and bleed all the air out.

once feul starts to come out tighten the nuts back up and re-try to start it. got it
give me a call tomoz if you get stuck.