Welp, finished the tranny, but the intermittent fuel issue I had is terminal now.
It appears that the cheap fuel pump I bought was in fact...a cheap fuel pump. In case I didn't explain it earlier:
The problem started as a no-start condition one day, about 3 weeks after replacing the fuel pump. The pump would not come on during crank.
I jumpered the Fp and B+, and at first, there would be no pump operation, but the jumper wire would start to get hot. Then, the pump usually started working in a few seconds of that.
But now, the pump will not run continuously without being jumpered, and the jumper wire still gets hot. I tested the ground for the pump, and there's almost no resistance. Then I checked
voltage at the pump plug, and its over 12 volts. So next week, I will replace the pump and see if that corrects the issue. There could be a problem with the circuit opening relay, or the FP relay, but I doubt it,
since jumpering in the diagnostic port bypasses these, and I still had the issue. Oh well, not a big deal.