Do Tappets need to be replaced on an ISX 12 2250 fuel pump?

[Redland1]

(10-30-2022 )tree98 Wrote:  

(10-29-2022 )Redland1 Wrote:  Wondering if the ISX 12 has the ceramic tappets like the ISX 15’s?

It's not just the ceramic plungers you have to worry about, the steel ones fail too. They must be replaced every 400K mi. regardless of what they are made out of.

Thanks.What’s the equivalent in hours? These trucks get way more hours than miles since they only drive to the jobsite and then run the PTO for a crap load of hours.