Fuel trouble on my 05 Expedition

...well let's start with the basics....have someone undo the 1/0 cable to the chassis/ground and wirebrush the corrosion off till shiny....then brush the chassis too...this connection has to pull 300 cold cranking amps...the startermotor pulls so much amperage that it actually "welds" the bolted connection and becomes uncertain and provides variable amperages and voltages under varying conditions...yes you've got 12 volts at the pump, but when goosed for more juice is starved of the amperage needed~...clean the main ground connection...things should go normal then~

ck to see if the check engine lite is off while cranking engine,if pcm is not getting a rpm signal from crank sensor pcm will not fire off injectors

I hate to be the one to tell you but by now, after all the money you've spent, you could have had the vehicle properly diagnosed and repaired. Stop throwing money at it.