I'm not a pre-waree. I have this motors manual that covers '30-'42. I share when people need info.
The list (103) does not show a Detroit carb being on the P's? But this site should be able to verify what you have is correct or not. Not me, just pointing that out.
Here's the Detroit write-up from the carb section which was not shared with P-info.
ps:It mentions a starting circuit, so that might be the one's that not functioning and letting gas go in, as it runs OK, after start, but just my guess. I've seen other early ones that have separate starting or vacuum idle that can be an starting issue. Probably needs a good douche/soak, cleaning, and adjusting, but enjoy today instead.
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