If you going to install an electric f-pump then you need pressure regulator or make sure you have a good fuel return line and place T-joint in the fuel line before the carb. One hose goes from pump to T-joint, another, tha is infront of it, goes to return line and 90 degree one to the carb. I did so cause I used to have FI when just bougth my Sammi and then switched to carb still having FI pump in the tank with relativly high pressure. Works great, no overflow issues.
Good luck!