I replaced my 6.2 in my K5 about two weeks ago. Ran just fine & then I parked it. This past weekend, I had trouble getting it started and noticed the fuel pump was leaking pretty good. So, I replaced the pump, bled the lines, and it still doesn't want to start very good. Killed both batteries. I've got fuel all the way to the injectors and bled the injectors as well. Any idea's? BTW, didn't even start up with either. I know you shouldn't use it, but it should've started with it.