We are on the same page then. I'm merely directing more towards the items we see commonly cause this issue. Checking each piece of a fuel system isn't necessary in my mind to diagnose the fuel pump. If they can't hear the pump run and the engine doesn't fire up, and when the pump is heard the engine starts. In that case the regulator and resistor are not causing the issue. That's where I'm going with this... many of the folks here don't have the level of tools and testing equipment that you and I have.
hose tools are nice, but if I'm on the side of the road, I'm diagnosing with whatever I have available. I can tell if the rail has enough pressure by pressing the schrader and it spurting out instead of trickling out. I can tell if my injectors are firing with a simple 194 corner light bulb.
Just trying to hone in on the actual issue instead of testing each and every piece possible.