Generally you don't need a return line. Late model fuel injection systems require a return but that shouldn't apply in your application.
In most cases it is better to mount the electric pump near the tank and it is also a good idea to use a fuel pressure regulator.
Both of these items can be obtained from most auto parts stores in both 6 and 12 volts. Electric pumps not unlike mechanical pumps sense pressure and will bypass. You can also use an electric pump to supplement a mechanical pump.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine