Up front in the area of the console look for blue tape around the wire harness. That's where you should find the female plug with 2 wires. Put a jumper across the plug and you should then have power back at the tank for the electric pump. It's a good idea to put an inertia switch in the jumper loop to shut off the pump in the event of a crash.
Sorry, this 240Z dash is not in the car but here are pictures of the dash wiring and the unused connector that could deliver power back to a fuel pump. The wiring comes down the right side of the heater slider assembly with all the wiring to the fuse box and center console connections.