The vent is the vent on the fuel tank I believe. If you have one of those new plastic EPA friendly self venting / unvented fuel tanks, forget that part. The idea is you don’t want the fuel pump trying to pull against a vacuum in the tank.

Yes, the float is supposed to sit parallel to the flange of the carb body when it is held upside down.

You cannot post a video directly to this website. It has to be posted to a hosting site such as YouTube and the link would be posted here. The video would be very interesting to see and it very well may help us identify the problem.

-Ben