I was taught to get a clear 2 liter bottle and a rubber hose,tie the hose to the fuel line and put the hose inside the top of the bottle and crank for 15 seconds, a stock pump will give you about a pint of fuel in the bottle. a helper to hold the bottle is always good.
This will tell you if the pump isn't working.

The eccentric can be felt through the fuel pump opening. but if you were running before than it seems to be working because if it was loose you'd hear it scrapping and scratching the timing cover.
My 2 cents, becasue I went through this last year. It was the fuel pressure regulator.