Mounting mower B&S engine problem

Hello municipality I would have solved a problem here where I need help. And indeed the screws from the oil tank and the motor hold on the frame have solved itself. My mechanic meant that this would have been the case with him. So the motor was completely removed, turned off (of course but without oil) oil tank, removed paper sealing residue, put seal in between and again, glued in screws, motor re-installed. And now it no longer starts normally, only with aids through the air filter (brake cleaner). Then it runs but first it spits fuel out of the air filter box. The LFK swims literally. If I want to put the air filter back on it he dies off. I thought that the float hangs or something. I had screwed up the carburettor and cleaned up but zero change. I would also have a two videos to watch. 20190802_164803.mp420190802_164644.mp4 lg and thanks for tips and or suggestions.