Installing an electric fuel pump

[Galvagni]

I am in the process of replacing the mechanical fuel pump in my R1 with an electric pump. My question is should I maintain a fuel return line as currently installed. The electric pump is installed on the frame roughly below the back seat. 

If yes, can I deactivate the existing mechanical but still use it to route the line to the carb and the return line? On the electrical side I have installed an oil pressure switch as well as an inertia switch so I should be OK.

Thanks