I was in frantic mode fearing I had a bad IP and tried all the suggestions given by forum members and tried so many different things that I forgot about this which I reported in post # 48
"I then put the check valve back in and cranked more, pressure went up to about 8 to 10 psi and it fired up!!! More later."
There is no mistake about that one. That 3 way banjo port on the filter head IS connected to the filter and not just a deadheaded mount for the 3 way banjo.
Dionysis, dance the jig some more for us.