whats the polarity on fuel pump?

[dvdevo]

i just installed a walbro on my s13 and i'm wondering which is the positive wire and ground coming out of the fuel pump cover? i know there are 4 wires coming out and the outter ones are for the fuel pump wiring but one is blue but it goes to the black wire on the walbro and the black wire from the fuel pump cover goes to the red wire. I just want to create my own fuel pump wires.

[welddrft]

This should help you out alot, I rewired my fuel pump with a 10 gauge power wire and a relay so that my pump gets full alternator voltage(13.6-14.4) instead of what it used to get 10.6-11.2(weak), so now my fuel pump is throwing out close to 262LPH instead of like 220lph or something.

White w/purple stripe= pump "+"
Blue w/red stripe= pump "ground"
Yellow w/ blue stripe=sensor for low level warning
Yellow=sender for gauge cluster meter
Black=pump holder ground

According to a 1991 240sx