Fuel pressure question

[tada]

Well the weekend is here and it's time to try to get the Boxster running. I did a fuel pressure test last weekend with a loaned Autozone gauge. Static pressure was 2.4 bars (too low). With the engine running, I saw about 3.3 bars. I assumed fuel pump and ordered one. I also picked up a new relay, but I ran the test with a jumper. Now before I open up the tank, what's the chance that's it's the fuel pressure regulator or a leaking vacuum line to it? I guess I should go get the tester again and try to get the limping engine to barely idle and pull the vacuum line from the regulator. Just doubting myself and probably overthinking it.