For awhile I've been having three seconds crank time. Priming it once will start quicker. Not until I've completed section 16 is when I wanted to look into it. It gave me the direction i needed to find what the problem was.
But first at WOT my fuel trims were high, though not high enough to set a MIL. I noticed my O2 were lean at WOT and my Baro Hz PID was way off. Cleaning the MAF didn't help so I decided to replace it and test drive the truck. Now the the trim numbers were balancing out at WOT and O2 going rich. Section 12 is what guided me for the MAF.
I thought the fuel pump was the culprit for those fuel trims but it wasn't. Now the long crank time issue. I guess for being anal I've waited till i finished Section 16 without skipping previous ones to investigate Lol. My truck has Mechanical Returnless system and 40 - 65 psi at idle.
It took two primes to get it up to 64 psi.