Bob - Thanks for the excellent pics and detailed explaination. But what do you mean by "don't drill all the way through the carb housing"? Dont' you need to to get the opening to the pump area? (which is looks like you did) and to slide the tube into? Also, did you barb the outside end of that tube? Also, how \ where did you mount the primer bulb? It must be accessible, but I'm guessing you don't want it visible? And is there a T connecting it to the fuel line in the tank? Where do you get these bulbs? What's the brand?
The only reason I'm hesitant to try this is I don't have a dril press, though I do have a vice grip. Might experiment on an old carb. Thanks in advance.
Mike