Dont know much about these but id say your best bet is to start where the lever is under the dash and trace it back from there, most likely runs along the door sills on the inside....
if your buying a nissan genuine cable to replace it, the parts person will be looking at a breakdown of the car to pick the part so you could ask to look at it, or get a printout of it and you would have an exact map of where it goes :grinning:
in the meantime lets hope u have a full tank