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.

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Besides the metal possibly being soft, is there any possibility that the arm on the fuel pump is bottoming out and causing excessive friction on the cam side ?
How does the cam side look & lastly have you measured a stock cam pump lobe vs the new cam pump lobe.. I wonder if there could be any measurable differences that can be causing excessive friction from **** machining