the only manufacturer that uses an intertia switch for the fuel pump is Ford. This style of switch [needs to be reset after a collision by pressing a button.
GM does not use this type of system to stop the fuel pump.
If you know what your missing I can help you further (not power to the pump, power to the pump, low fuel pressure, etc)
I’m happy to assist further over the phone at
https://www.6ya.com/expert/jeremy_d728a59f986299fa
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