i reread your second post where you caught the problem. the only things i can think of is the pump couldn't pull the required amperage for full operation (wiring), the pump was defective (you replaced it), or the pump worked fine and something was leaking the fuel out before the pump could build pressure.
did you use any fuel system cleaner as suggested?
As a licensed aircraft mechanic, I have never heard of the need to use fuel system cleaners like all the ones that are highly advertised and widely sold in automotive. Maybe that's exactly what my car needs, who knows. Part of me says those products aren't going to make a hoot in a hail storm of difference. It looks like it is just snake oil and expensively bottled isopropanol and kerosene and a few other solvents and mineral oil type things, which it is if you read the MSDS on Seafoam and all the other similar products.
On the other hand, if I put one bottle of this concoction in my fuel tank, and it starts up perfectly from now on, I will be amazed and sing the praises of these products like everyone else. My experience has been that all the perceived benefits are anecdotal and unmeasurable, and about what you would expect for putting a little IPA in your gas.
Anyway, it may come to the point I put Seafoam in my tank. Until then, I will continue to check the things that make sense that actually measure the physical facts about how the system is working or not working. All this is in hopes of finding the problem the old fashioned way that has worked for decades and still has some value on these newer, computer controlled cars. There is still a lot of good old fashioned physical mechanical and electrical substance to these cars even if they have a computer that is dealing in unseen electrons.
I will update here when I find out what the sum total of all the physical checks show the operating status of the systems to be. I'd love for this problem to disappear with a $10 bottle of IPA and mineral oil, but I am also a mechanic at heart. We'll see which one has the solution, maybe both, I don't know. LOL
At least I am not too sore today from all that rolling around under the car yesterday.