stalling when on 1/4 tank

[Curtis]

a while back i had a issue with the tracker disabling the fuel pump and i thought it was a faulty pump.i removed the pump to check it over and reinstalled it.now for the past few months the car will die from no fuel although the low petrol light hasnt come on and also when going down a hill, or if the car has been left on i hill nose first it wont start.not sure if the pump needs to be calibrated or if theres a blockage. but other day was stuck in traffic on a downhill, gauge said 1/4 tank light wasnt on.yet heard the pump running loud suddenly and the car stalled after a min and wouldnt start.