Q: No start, lack of power to fuel pump

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My truck just died while driving, towed it home and installed new fuel pump. Drove it a week and the same thing happened. Engine just quit while driving , replaced fuel pump and drove it for a week, engine quit again. Towed home pulled pump and only have 6.9 volts with key on. Cranks no start . Pump Hase no sound, no pressure at fuel rail. Pump works when running 12 volts direct

My car has 128000 miles.
My car has an automatic transmission.

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