The pressure regulator is simply a release valve. It releases into the tank and it's unlikely you will hear it. You should hear the pump running for a few seconds when you turn the ignition on. If the engine is not turning, the ECU by law has to switch the pump off after a specific time. Three seconds from memory.
Try putting slips of copy paper down the throats to see if the injectors are firing while cranking. If they get wet you have some fuel pressure, but maybe not sufficient.
Make up a hose with a pressure gauge, that you can put in-line from the tank. Easy if you have a quick release fuel line connector. The pressure should be around 50 psi.