Cm2250 Won't prime/no fuel in water separator

[HamblinTrucking]

no trouble starting and seems to run ok (other than not building enough boost and lower power).

Rail pressure isn't dropping either, its perfect.
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Maybe the davco is working fine and your low boost, low power problem is something unrelated. Its not uncommon for the fuel level on a new davco filter to be very low and still work just fine.

Just a thought
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Yes, I have heard that as well. My low boost under heavy load and empty water separator happened together. I've always had an inch or so of fuel above the retaining ring every time I change it. Now I don't.