kubota bx2200 acts like its starving for fuel ?

i had the problem of my bx2200 acting like its starving for fuel so i changed fuel filters both and while i had mid mount mower off i used the tiller for 3 hrs +/- and i put the mower back on and mower about 30 mins and it started the same thing again could it be the fuel pump getting hot and acting crazy if you let it cool off it run ok for a min or two any help appreciated