Just completed install of a new Carter. I've been reading about 4-5 psi last few days. I had been at a steady 7psi for a while and was only putting of the inevitable. I picked up a new pump and harness yesterday at the Cummins dealer, $145. New pump reads 15psi at idle, 12 @wot and 13. 5 cruising @70mph. After I hit 100k I'll probably add a pusher.