[tada]

I just reran the pressure test. Maybe I did something wrong before. This time static pressure was about 3.8 bar (good), and when running 3.8 bar (still good). But after the static test, I performed a leak down test and I'm losing about 1 bar in 10 seconds. Then it levels out at around 2.4. So it sounds like gas may be leaking back into the fuel pump through the check valve. I inspected the vacuum line to the fuel regulator. It looked fine with no gas in it. With the engine running, the pressure dropped about 5 psi with the vacuum line to the regulator disconnected. But now when I jumper the fuel pump relay, I now hear a hissing noise from the regulator. That's with no engine on. Kind of a whirring noise. Car still does not run smoothly or rev at all. So, do you think it's the regulator or the pump? I'm now leaning towards the regulator being bad, it sounds like it is leaking gas during static testing. All help is appreciated.

P.S. The new pump looks identical to the one in your picture above.