Now you need a way to make the fuel pressure regulator think it's seeing turbo boost. Adjust the air regulator on your compressor to how much max boost you think you will make. Connect a hose from the boost reference port on the fuel regulator to the air regulator on your compressor. A cheap air tank with 15 pounds of pressure in it will work in a pinch. Fuel should be flowing into the gas tank and the individual injector containers.
Fuel vapor is extremely volatile.
Set your fuel pressure to 30 PSI without the air hooked up and make sure your fuel pressure increases to 45 PSI when the15 PSI fake boost pressure is put on the regulator reference port. Note how much fuel is being returned to the tank with and without the extra 15 pounds of pressure. If the return fuel line goes dry when the air pressure is applied then your pump is too small to feed the injectors at max boost. If you were to run the car like this it will be too lean under boost and you will damage the engine. If the fuel pump tests ok, empty the containers that the injectors were spraying into and this time get your watch out and run the injectors for exactly 1 minute.