New to me 2016 Prostar- What now?

[jimeneztrans84]

How often do you replace the fuel pump plungers and tappets? Anyone have a part number for the 2 cyl fuel pump plungers and tappets? I replaced mine like 250k miles ago but can't remember the part numbers. I got lucky truck had 475k with 3 cyl pump, bought it at 450k and prayed every day untill I changed it that the plungers wouldn't take out the motor.