I just tested the fuel pressure-
Initial key on, fuel pump humming: 61 psi
Key on, engine off: 52 psi
Key on, engine running: 54 psi
Key off: 52 psi. In this state, the pressure drops slowly. Without timing it, I'd say maybe 2psi per minute.
What's next?
ETA: I guess the pressure drop is slower than that. It still had 30 psi an hour later.
I hooked up a scanner to look at anything else that might be of interest. The ECT was showing 90 degrees. I'm not sure if that's too high or not. Today's high was 65, but I ran the engine briefly an hour earlier, and everything was cool to the touch. I guess I'll let it sit for a few hours and scan it again.