Simple to describe. Mount the electric fuel pump as close to the gas tank as you can. In the gas tank is even better.

Disconnect the mechanical fuel pump and install a blockoff plate.

Connect the frame fuel line to the engine fuel line. Connect the return line to the regulator return port if it has one.

Figure out where to get power for the fuel pump.. you need enough amps to run the pump and the power has to be switched with the ignition. Consider hiding a switch in the power line as an antitheft device.

R.