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Hi, your high pressure pump, or also known as an injection pump has failed. This basically controls everything on your 6.9.
Now during replacement, I recommend finding the highest quality pump you can find. A lot on the shelf of parts houses that are worn out, or stuck just from sitting. Best bet is always having your original pump rebuilt by a local reputable diesel shop. I have replaced up to 5 at one time before doing what I recommend. Had a good diesel shop repair the original and was good to go.
Not much to these engines, this pump basically controls everything.