Fuel pump pushrod failure

I had my factory pushrod fail after a cam change. The pushrod wore 1/4 inch, but the cam lobe was still fine. It was a stock fuel pump, not a high performance one. I bought a new rod from Mancini's and a new stock pump, but I am afraid to use them until I figure out what caused the failure.
Had the same experience, same amount chewed off, bought same pushrod, all`s well so far.
Maybe new cams are harder than oem rods, my cam looked fine too. oil pump lost no pressure.
I`m lettin it eat, damage is already done. Good luck