Pickup a fuel pressure tester at an auto parts store. Hook it up at the fuel rail fitting. Turn the key to on a couple of times, then bleed the air out of the tester. (There will likely be a little button attached to a hose to accomplish this. Put the end of that small hose in a container to collect any gas.)
Then turn the key on and off a few times to get your highest reading. Then start the car and see what that reading is. Remove the vacuum line from the fuel pressure regulator, and check that reading. Turn off the engine, keeping the gauge attached, and check to see if the pressure drops. Try for at least 15 minutes, maybe getting a reading every 5.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.