A while back I threw in a new fuel pump. Sends 350 LPM. from what I've noticed ever since, the engine runs a lot hotter than usual especially during summer months. At stops or red lights it'll boil over sometimes. I'm assuming she's running hotter/richer because of the bigger, stronger fuel pump. Would an upgraded water pump and bigger radiator help get it back to normal operating temps? Or is there something else I can do that I'm missing

 

What year is your Mustang? Engine? Could need a new radiator cap...maybe a new temp sensor.