installing in-line fuel pump

Anyone have any tips/suggestions on installing an in line fuel pump on an 85 p/u.The mechanical pump works perfectly in hand,not on the v6.Assuming the cam that pushes the rod is no longer oblong.this truck also has dual tanks.Any thoughts?

I'm assuming that the rod moves freely in the hole? You have two options with the duel tanks. One is to mount a single pump right after your inline tank switching valve. Second, which I prefer, would be to mount two pumps one right at each tank. Then a three-way switch on your dash to opperate each pump independently. Good luck.