Fuel pump pushrod failure

I did not check the stroke on the fuel pump arm, although it did seem rather stiff to push by hand. It is bolted back to the engine without a rod essentially as a block off plate. I did check the stock cam that came out and found that the lobe lift was 1/4 inch. I also used a piece of wooden dowel and spun the motor over to check the cam lobe lift and found it was also 1/4 inch. It was the original pushrod that went back in when I changed the cam, and the wear was on the cam end.