Two weeks ago I replaced the carubertor and gas tank, along with spark plug on my gas edger. It's a walk behind type with a B&S engine. Anyway, the carb came pre-built but it won't prime now. When I first installed it, it started up no problem. But now it won't prime at all. I'm wondering if maybe it is a gasket issue. I can pour a little gas diretly in or use starting fluid and it will run just fine. Just won't prime.

Which Briggs engine/series?

Wes is probably right.

550 series 158 cc. I replaced everything because my son put the oil/gas mix into it all last summer and we had to spray starting fluid in it to start. Once I figured out he was doing that I just decided to replace everything.