HouseCallAuto 4/15/2010Ok, when checking the fuel pump wiring on this Nissan. The Black / Yellow wire is the wire (at the pump connector) that should have 12 volts during cranking. It should also have 12 volts for a few seconds when the key is turned to the on position (engine off). You can test these wires with a 12 volt test light. The only wire to pay attention to is the Black / Yellow. This is the power to the pump wire. So I will assume that you have checked the ignition for spark and you saw that you have spark. If you do not have power on the Black / Yellow wire, then you may have a bad fuel pump relay or an open fuse (fuse #17 - 15 amp).