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Q: Fuel Pump problem on 1996 Ford Aerostar

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Got new complete sending unit and both lines are hot, but when I plug it in to fuel pump its not receiving juice to the pump. Had the fuel pump checked and its good so what could be the problem? When I unplug the ground wire and put a test light to it its hot, but when I plug it back into place its not hot on either side coming to it. Can somebody please help me resolve this issue?
(1) Answer
I'm looking at the wiring diagram at it shows 4 wires to the sending unit, and a solid black wire for the ground, is that where you are getting 12 volts? And the ground wire is not connected? And you have 12 volts to the pink/black wire only when trying to start the car?
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