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Can you take a 12 volt test light and or a volt meter at the inertia switch check and see if you have key on engine cranking power on both wires at the switch?
The inertia switch is the fuel cut off switch and its located in the passenger side kick panel. If the pump checks okay then we need to check the power supply from the fuel pump relay to the pump starting at the inertia switch. Need to check for power in and out of it while cranking the engine. Let me know the results and we can work from there.
The button should be DOWN. You are going to need to test the power in and out while cranking the engine over and with the button down and the switch connected. If you have power in and out then that means the computer is grounding the fuel pump relay and sending power on the circuit to the pump.
Okay, the fuel pump is controlled by the fuel pump relay that is controlled by the ground switching signal from the PCM (computer) you next step should be to check and see if you have key on power at the fuel pump relay connector on the red and the yellow wire. If that checks okay then check to see if you have a ground from the PCM on the lite blue/orange wire while cranking and power out of the relay on the dark green/yellow wire that feeds the inertia switch to the pump. If you have power at both pins and no ground then that means the PCM has failed. See the wiring diagram in the link below for testing reference. Let check both pins at the pump first and we can work from there if needed.https://www.dropbox.com/s/tre83ltotzfa7g1/fuel%20pump%20Jun%207.pdf?dl=0