pip1

Hello can anyone help me my sc 400 will start fine everyday but once up to temp and i turn it off it wont start it just splutters and eventually dies then after a few attempts it will start fine and runs perfect would it be the pump ecu or fuel pump itself i have an after market walbaro 255lph fuel pump from my supra if i fit that will i need the ecu anymore can i just bypass it and the car will run fine. Please help me