Measured voltage across terminals of fuel pump with ignition in On position get 0 volts.
The pumps will not run for more than 1/2 a second or so when the key is turned form off to on unless the engine is actually being cranked or is outright running. (safety feature so you don't get incinerated in an accident)
Measured same with engine cranking get 2.5 volts across terminals.
This would be a bad thing.
Most likely culprit is really grossly corroded or crap connections in the circut.
Grounded fuel pump terminal to battery negative terminal checked voltage across the fuel pump terminals when engine is cranking got up to 5.5 volts
Implies that the pump power issue is on both sides of the show, not just the -ive circut.
Hotwired the fuel pump direct to the battery heard the pump activate for the first time. –This put pressure in the fuel system. Disconnected hot wire power to the fuel pump reconnected conventional fuel pump connections - cranked engine and got combustion then motor stalled.
Pump ran when direct connected, but as soon as unhooked things reverted back to the afore mentioned poop power circut.
Engine ran long enough to bleed of residual pressure, then died.
I made the boneheaded mistake of reconnecting the hot wiring to the fuel pump and starting the car simultaneously.
Shoulda been no harm in doing that, unless something is really screwed up somewhere.
Still looking for the Second relay if I tested the A/C relay and not the FP Relay.
Please to click the l-jet diagnostics link in my sig block.
It has a labelled photo of the relays in question as described previously in this thread.
Suffice to say that there are no relays under the hood that are relevant to the fuel feed system, so if you're playing with relays under the hood, you're wasting your time.
While doing all this voltage testing and whatnot, have you been checking both the in~tank and main fuel pumps for function, or just the main pump underneath?
If the fuel level is low and the in~tank pump isn't working, the main pump can't draw fuel up out of the tank well (if at all) even if its working at peak efficiency.
What is the voltage of your battery at the battery during cranking?
If it's under around 10.5 or so, the ECU will not turn on so the injectors will never come online regardless of the pumps supplying fuel.