Set my 2100 carb. wet float level per specs. runs much better but my question is--after shut down and car sits for a while I rechecked level and it dropped an 1/8th." restarted up rechecked and back up to correct level.Is gas flowing backwards for a second until neddle seats(new needle/seat) or is it seeping out venturis, cann't see any gas dripping but can smell fuel down throat. So is this drop in gas level normal? And a surge back up 1/8th" due to pumping action? Thanks for your help.