Clogged fuel filter or air in the fuel line?
I wonder if the fuel filter got plugged with debris after letting the fuel run completely empty. Could try looking and the filter for obvious debris and try to clean or replace as necessary. Not sure if perhaps there is air in the fuel lines that is giving you some issues. Maybe you could try priming the fuel line somehow. Anyone else have suggestions?
'12 Honda CBR 250 Tri-Color
Akrapovic Carbon Fiber Exhaust