Webers required less than 4 psi pressure. The 720 carburetor doesn't.

The regulator goes into the fuel line after the pump.

That being said, my 1200 has neither the regulator nor the relay

Both are a good idea, but it will work without it. The carburetor float needles may handle the higher pressure, but aren't guaranteed.

7 psi


http://datsun1200.com/modules/mediawi ... ?title=Electric_Fuel_Pump