Ok, dug some more in the fuel system today. Could not get a picture down inside the intake with the cheap amazon borescope, so tried just seeing how much fuel was coming out at the rail. Pulled the injectors and made a little tray from an old motor oil container.
Does this seem like enough to create 40psi inside that rail?
Pulled the hose off right at the tank and ran the pump again and captured about the same amount.
Detached the fuel hose connection behind the intake and then used an airline to blow out both the fuel rail (with injectors still removed) and then the hose from the tank up to the intake connection.
Then I pulled the fuel pump out and found this split in the hose at the pump.
Took trips to both autoparts places near my house to find some 5/16" fuel hose, and by the time I got back, the light was gone, so will have to wait until tomorrow to see if this is finally the problem.