I replaced the engine in my Supra it is a 7mge.

I replaced the engine in my supra it is a 7mge ingine. The old engine had 160,000 miles on it, the replacement had about 40,000, engine is in car and turned over but the fuel pump won't shut off. It overloads on fuel, then it was idleing just right and then nothing, now it wont start. What could be causing it to do this?