It is going to be a little easier to test the pump in place.
The first thing to do is test the voltage as near the pump as you can. These pumps are quite sensitive to low voltage. Runnign the pump at 13.5V for the tests would be a good idea.
The next step would be to verify pum volume output. Make sure teh pump can deliver at least a full pint of fuel in less than 15 seconds.
If that passes, test the peak pressure by blocking the fuel return line from the FPR. Only test the pump briefly in this manner, since the dead-headed pump will be under considerable stress to make 65 PSIG or so.
If all that is in order, the pump is fine, and you have other problems, such as the regulator.