Disconnecting EGR didn't help, which eliminates clogged cats as the root problem? Doing a more thorough Schrader valve check (key to on) I got a little squirt of fuel upon depressing the pin. But that was it. Pressing it any further at that point gave nothing. But I still hear the distinct whine of the fuel pump upon key on??? So unless anyone has further suggestions, can I move into asking what options there are for the fuel pump? I'd like an upgrade, but not overkill. Still on original injectors. I've learned it's usually a waste of time to research old posts for suggestions of available parts since some are discontinued or replaced by upgrades. I'll hit up RockAuto and Summit right now . . .