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4 hours ago, PaulArthur1 said:

Just kind of wondering what red light or too low of fuel pressure would be for 6.7. I know factory specs is 11.5 and I'm normally about ten. But I know 3rd gen I believe that 10 psi is way too low. I think they have the VP pump, unsure.

The CP3 cares more about flow than pressure. All 3rd gen and 4th gens thru 2018 use the CP3

Stock is 8-10 at idle and 6-8 cruise. It can dip down to 4-5 under normal operation and is fine.  I believe the Bosch spec even allows for some vacuums, but positive pressure is the recommendation. I set the warning light on my 05 to 3 psi and only saw it with COLD fuel, that was with 3 fuel filters and 150 rwhp over stock. 

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