Fuel pump actuator

[JMBT]

For anyone wondering the fuel pump actuator for the 2cyl and 3cyl pumps on the CM2250 & CM2350 is the same per Cummins. The new part number is 4307411 and it replaced 2872888.
I just replaced mine and it helped the problem I was having with measured fuel pressure deviation from commanded pressure and surging at idle. The truck was runnng fine even with a fluctuating 3000psi deviation between measured and commanded pressure. Even pulled great at 92,500 lbs gross. The only clue of the deviation was a surging sound at idle and while in cruise control. Was the repair necessary? I don’t know. But the new actuator seems to have fixed it for the time being. I now have about a 300psi deviation between minimum measured and maxium measured when the commanded is constant. Leakdown test looses 500psi in 60sec, on a CM2250 with 642K.

Also a side note, the actuator I replaced was brand new, NOT reman, and less then a year old.