is there an aftermarket fuel pump in it ??
does it make a load noise wen u turn on ignition before u start the car ? if there is a load buzzin you'l know its uprated fuel pump...
if there is find out wat make it is...
possibly walbro by the sounds of it.. ive heard of a good few walbros goin to shit when the car runs out of petrol , with walbro pumps ya shouldn let the petrol go below quarter of a tank....
gtr pump are ten times better

if you decide to replace the pump id put in a gtr one if i was you
