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Ok. We need to make sure your Mustangs fuel pump has power going to it. It has an inertia switch, fuel pump driver module and the Constant control relay module which control power to the fuel pump.
if either one of these fail, the Mustang will not start.
You will need a test light or a digital multi meter to do a few tests. Please let me know if you have one of these.
Did he replace the complete fuel pump assembly or just the pump motor?Where did they get the replacement part?