2011 cm2250 fuel line howl

[RollinCoal]

I ran across this a few years ago and it in fact was the fuel pump thanks to a Cummins tech down the street he dug up an old TSB that explained it, It was the plunger and spring
in the fuel pump (they no longer sale the repair kit)
I happen to have another truck on the deadline with the same pump so I swapped the plunger assy around and it actually quit the noise.
Ill see if I can find the email he sent with the TSB