Update #2:
Last night I ran the car as it was cooling down to repeat the sane conditions as the day before. Fuel in the lines, and then I shut it down right away before it got hot.
This afternoon I started it and it fired right up.
I shut it off, disconnected the rear line on the accumulator, plugged the hose, and put another hose from the accumulator to a catch container. Started the engine. And fuel steadily streamed out of the hose until I shut it off. This was not residual- I let it flow for about 10 seconds and it did not slow down. It was not a gush of fuel, but more than drips. It was a steady, small stream. (Picture attached)
I reconnected the fuel accumulator, ran the engine up to temperature, and shut it down. Waited a few hours to allow it to (apparently) vapor lock again.
I do not have a dwell meter to check the mixture.
After a few hours, I tried to start it. No start.
I disconnected the CSV. No start.
I plugged the WUR canon plug into the CSV. It stumbled for an *instant* and died. It did not fully start.
I reconnected the plugs as they should be; no start.
I pushed down and released the air plate firmly and swiftly released. It started after that.
So, accumulator, right?