Originally Posted by zeneffect 
Rewire the fuel pump with a relay. Sounds like it's arcing to ground somewhere when it wants more amps which is blowing your fuse. What was your end to end resistance on the fuel pump circuit? I bet it was really high, or intermittent.
There should already be a relay for the fuel pump. OP said it was an NX, and I know the B13 Sentra had a relay for this.
It's entirely possible that there is corrosion on the pump wiring that's in the tank, or since the pump was previously swapped, there could be some bad connection that has oxidized causing excessive current draw.
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