Thank you guys, i do have a 1973 datsun 240z, again sorry guys im new to this so im not sure what the part is called but there is a part that is attached to the tank that has two wires coming out of it that run to another part that looks to be attached to the chasis (fuel pump or is that the sender) but regardless there is a blue wire connected to to that part attached to the chasis which the blue wire runs into the car, and the part coming out of the tank with the two wires one is connected to the part on the chasis, another the other is just dangling there, black in color, and the part connected to the chasis has another wire that seems to run on top of the tank... sorry if i sound confusing, i hope it makes sense, i thinking that wire coming from the part connected to the tank should be connected somewhere, but where? there are no other wires loose for it to connect to.