I rebuilt the Stromberg WW on my 1961 GMC V6 305 4WD Suburban and post rebuild, it would run fine, but I had to prime it to get it to start. I took it apart again, and found debris in the screw that holds down the accelerator pump nozzles. The hollow screw is also the fuel passage for the accelerator pump nozzles. I cleaned that out and problem solved, it will cold start on the choke.
I'd never pondered it before, but it seems that the circuit that mostly flows during choke application on that carb is the accelerator pump circuit. That appears to be a logical circuit to flow when pressure below the choke plate is reduced, because the fuel in that circuit is higher than bowl level, held above bowl level by a check ball. Of course fuel flows from elsewhere if the carb doesn't have an accelerator pump. On carbs with accelerator pumps, is that where fuel for enrichment comes from when the choke is applied?
I'd never pondered it before, but it seems that the circuit that mostly flows during choke application on that carb is the accelerator pump circuit. That appears to be a logical circuit to flow when pressure below the choke plate is reduced, because the fuel in that circuit is higher than bowl level, held above bowl level by a check ball. Of course fuel flows from elsewhere if the carb doesn't have an accelerator pump. On carbs with accelerator pumps, is that where fuel for enrichment comes from when the choke is applied?