How Do I Test The Fuel Pump?

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96Discovery

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96 Discovery, 4.0L, V8, Petrol

I would like to send 12 volts to the fuel pump to test it. I see there is a 4-wire plug going to the pump: (1)White/purple wire, (1)black/green wire and (2)black wires. If I connect the white/purple wire to the (+)positive of a battery and the other 3 wires (black, black and black/green) to the (-)negative of a battery should the pump turn on? or is the black/green a (+)positive wire??
 
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