Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Make a test hose and attach it to the inlet of the new fuel pump, and drop it in to a fuel container or back into the fuel filler opening and see if engine runs right. this bypasses the tank and the outlet hoses up to the fuel pump.
I see question is still open, did you see my response and do the test?