Probably the failed in-tank pump has been that way for months or even years. I'm fairly sure that won't change your situation.
But I have a question about your clear and plain words: "Oh yeah, main pump runs strong, either by direct jumper from battery, or just connected to the harness, with key on. "
If your pump(s) run more than 1 second just by turning the ignition key to KP-II your car has been doctored by someone in the past. Fuel should not be pumped, except for that initial bzzzt, unless the engine is turning! Dangerous in a crash.
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Art Benstein near Baltimore
"Any intelligent fool can make things bigger and more complex. It takes a touch of genius - and a lot of courage - to move in the opposite direction."
-Albert Einstein
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