Nissan Micra?

Nissan Micra MReg (1995) 1000c

Had trouble with the fuel pump(electric). Took it out- tested it- did not work- tapped it a few times. Tested it straight to battery and it worked. Put it in again no luck starting the car. Took it out, tested it - it worked. Started testing the wire found no power somewhere between pump and where wires dissapear into carpet. Any ideas?

Is there an inherant problem with this. Anyone know where I can get a wiring diagram on the NET.

Thanx