Ok it finally stalled out after 30 mins. Pressure dropped to 10 psi and she shut off. When I turned the key back to run, pressure stayed at 10 psi, I could hear (and feel) the rail pump running. I opened the (rear tank) fuel lines just before the selector switch, turned the key, and nothing came out (other than a small drip which was coming out when I initially disconnected it.

I guess I'll start with repairing the fuel line, and if things are still screwy after that, replace the pump. Does that sound like a plan?