the loss of power symptoms came on over time.
I've never tested the GP temp sensor but have thought of it as a possibility.

fuel is correct color, no bacteria.
no water
I have put clear fuel lines in for inspection to see if I had air in the fuel. I didn't have any air before the IP, but don't recall if I had any after the injectors. would air after the injectors be a concern?
My fuel filter pump does not stay solid if I pump it up. the pressure will drop off after a few seconds, is that normal?