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Hey everyone I replaced tappets ,pump,barrel etc . I have been getting 559 code which I did post earlier in the posts. I went ahead and pulled the head back off the pump to check the head. This is what I found. The tappets are fine cam in the pump is good. The barrel valve and plungers were like this when I took them off. [attachment=9265]

Yea that's a problem. The pump needs a whole new head, the check valve inside it is bad.
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(12-23-2023 )tree98 Wrote: [ -> ]Yea that's a problem. The pump needs a whole new head, the check valve inside it is bad.
.Hey tree do they sell a rebuild kit for the head or do you have to buy a whole new head? Thanks for the input.

Nope, you have to buy the whole head

(12-23-2023 )tree98 Wrote: [ -> ]Nope, you have to buy the whole head

Best place to buy? Cummins or aftermarket rebuild?

Genuine cummins only

Here is a little insight on what Tree is talking about...check post #23:

https://rawze.com/forums/showthread.php?tid=7266&page=3

I did this a couple years back. You can read the whole thread if you'd like, but post #26 explains the parts list I used....

https://rawze.com/forums/showthread.php?tid=7266&page=3