when my pump buggered it done the same,check my thread (s2 wont run,finished for now)
theres a possibility that the impellar has worn in the pump,therefore it will wizz round,but wont push fuel through,so if you know how to do the pressure check this could confirm a few things,1 as above,2 theres a blockage,3 a leak.
my guess is the pump. could be wrong tho.