I managed to nail down my vacuum leak issue. I mentioned earlier that a T fitting was leaking. Once that was fixed, the gauge was still bleeding down ever so slowly. I narrowed it down to the fuel pressure regulator. I isolated that and put the vacuum directly to the regulator. It bled down relatively quick. Because it's hard to hear a very small vacuum leak, I decided to apply pressure to the regulator. I set my compressor to 20 psi and put the hose on the regulator port. I heard a distinct hissing coming from somewhere, so I grabbed my handy mechanic's microphone and hovered it around different areas of the regulator. The air was coming right from the adjustment screw on the top of the regulator. I unscrewed it and noticed there was no kind of gasket or sealer on the threads, so I wrapped the threads in some Teflon tape. After re-testing the vacuum to the regulstor, it was rock solid. Didn't move a bit.
I'm going to call fuelab and just make sure there isn't an internal issue with the regulator that was causing the leak through the screw threads. If some tape is all that was needed, I'm happy with that.
I tested the whole vacuum system again. Set it to 20in and went to get some lunch. And hour and a half later I came back and the gauge was at 14in. Good enough for me! Time to start this thing up again and see what kind of vacuum I see now. I just need to wrestle the fender liner back in and get the wheel on first.
I
I'm going to call fuelab and just make sure there isn't an internal issue with the regulator that was causing the leak through the screw threads. If some tape is all that was needed, I'm happy with that.
I tested the whole vacuum system again. Set it to 20in and went to get some lunch. And hour and a half later I came back and the gauge was at 14in. Good enough for me! Time to start this thing up again and see what kind of vacuum I see now. I just need to wrestle the fender liner back in and get the wheel on first.
I