The accelerator pump is working fine. If I turn over the engine without the key on, and then look down the throat of the carburetor and manually pump the throttle I get nice neat jets of gas down the throat. If I do the same thing immediately after the engine dies it's half gas half air or nothing at all. No leaks or dribbles on the carb. It seems to fail more like starvation rather than flooding, but I'll check the inside of the manifold when I pull it tomorrow.
I don't have a gauge for testing the fuel pressure psi. The flow into a bottle seemed ok, definitely not too high, if anything it's a bit modest on the output. The current fuel pump is 3 years old, made in China, which is why I'm suspicious of it. Replacement parts these days have no durability.
