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Sounds like you used a good systematic process and narrowed it down to the pump or the fuel electronic system.
The spark plugs are firing, so the crank/cam sensor is good.(btw there is a clip-on-fake-plug tool which makes removing a plug not necessary.)
A "noid light" will show a quick check if the injectors are firing(or being told to).
There should be a shraeder valve on the fuel rail to check pressure.
There could be a bad ground connector on the electronic side.
Checking voltage at the pump might be the last step.
I'd think a weak pump would be problematic with loss of power for a while first, but it could just croak.
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