2001 Fuel Pump

I was sitting in my car with it on and all of a sudden the engine light came on and said check oil pressure and the car turned off and will not restart. The fuel pump was not getting any power so I replaced fuel pump and relay switch and still no power to the fuel pump. Someone told me that the fuel pump reset button might need to be pushed but had no idea where it was located. Where is this stupid thing cant find it anywhere. What else could be the problem