Over last year or so have replaced 3 or the pumps (passenger side of engine) truck is 2006 grey motor. Read somewhere that reprogramming needs done after replacement? Idle is rough.

We had a similar issue with our 2006 Mack after installing new EUP's we found out that you will need to have Mack adjust the trim codes and update your computer software. Check out "Mack truck running rough" hope this helps!