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How would I energize the fuel pump from under the hood so that I can check for line breaks/shorts?
You can pull the rear seat and carpet and energize the pump directly - at the pump. Unless it was corrected, the 2000 model year FSM has the polarity backwards for applying voltage to the pump.
Thanks - I already energized the pump directly from the battery to do a pressure test and rule out a bad pump. It is fine. And I jumped the relay, so that's ruled out. I need to energize the pump from the engine bay if possible so I can look for line breaks/shorts. I appear to have either an electrical break/short/ground issue or an ECU issue. At least that's what I think. ECU & electrical issues are a real blind spot for me - I have zero experience with them.
Those reading didn't sound right... So remembering @SteveH reply above, I started looking at the wire under the rear drivers door. When I unplugged the harness there, 289K miles of crap dropped out. A little electrical cleaner later, the resistance is 1.3 ohms at the ECU harness and the truck fired right up. Success!
Thanks to all of you for putting up with my complete incompetence and continuing t help me through this process. Now for mods that I understand...