Fuel pump

Could be that the concentric cam on the front of the timing chain is incorrect or loose. Or if the pump is not seating correctly on the block. The noise could be from the pump arm coming back in contact with the concentric for the pump cycle then leaving contact then recontacting then leaving contact...... ect. make sense? This would also create a shortened pump cycle since its not getting the complete ride. What PSI is the fuel pressure at ?