I can't help you with your fuel pump, but if it is keeping you from moving forward with the project you should be able to bybass the pump and get it to run pretty well. I have the newer pot metal and while I was waiting for my daiphram (From Zimmerman) I plumbed past the pump and kept the fuel tank three fourths full and it ran fine. Don't know if this helps but maybe it will get you by until you find your parts. Good luck,
Beau