fuel pressure? for the racers...

This past weekend i had to re-adjust the fuel pressure 3 times,set it at 7 1/2 made a few passes checked it,and it was down at 3 psi,re-adjusted and it was up to 10 psi,re-adjusted again to 7 1/2..what do you think?? fuel pump going bad regulator and pump going bad??...thoughts..i run the holley black pump and larger holley regulator..