Negative on the low pressure pump for my 6.7. Put it in and the truck would not start or build fuel pressure. Popped the line off at the secondary filter and it hissed like air escaped. Purged the line and suddenly I had good fuel pressure. Then I realized the secondary filter, even though it was a new WIX, was plugged. I'll have to get a pic of the cut open filter. It's clean but sucked in at the middle
The first time I saw a restricted secondary filter I figured it out right away, the second time I got burned completely. Perhaps I need to get my head out of my ass?