What happen is that some how, the float had busted and would fill up with air as I was filling my tank, Then it would rise to the top and read as full, after a while the air would escape and the float would then fill up with gas and sink, making it look like I had sucked up alot of fuel in a short time.

you gotta pull the fuel pump/level assembly out of the tank and repair it. Your float may be screwed up, or leaking, or the mechanism may not be swinging freely. Simple, remove the filler intake, remove the cover,and pull the entire unit out.