Here's a new thread about my mower problems. You may remember the old thread. Anyway, here is the status. I just took the carb off and brought it into the Briggs repair shop and they soaked it for a day in some sort of acid to loosen the gunk in it. I got it home and reinstalled it, and it starts but won't stay running unless I keep hitting the primer. One thing I noticed when putting it back together is that the float valve seat seemed to be a little loose. I thought maybe the seat was sliding down against the float valve and keeping gas from getting in there. Suggestions?