There are a few options.
-JDM AE86 Tank and EFI pump - available through a few specialist AE86 parts suppliers. Buddy Parts springs to mind.
-Some use the ADM AE86 tank and use the factory pump as a lift pump to a surge tank, usually mounted in the hatch section or under the car. From there they run an EFI pump (VL Commodore pumps are common) to the fuel rail, and a return back to the tank.
-Some do the above without a surge, one pump into the other. That's a no-no.
-Some just use the carby pump and keep a full tank of fuel. Again, that's a no-no.