GordnadoCRD wrote:
I wouldn't second guess the need for MPROP replacement, as you've already seen the results. Secondly, the MPROP is "upstream" of all high pressure fuel, so any shenanigans there cannot influence the MPROP directly. The only way would be if the ECM also sees the readings that you are and believes them. It would be trying to correct them within the limits of it's capability. I doubt that it is though, as if it believes those readings, it would shut everything down to protect the whole injection system.
Some of your readings are impossible, so I would look for poor connections, or wires with failed insulation Or, as Flash mentioned tool interface with the vehicle. Also check to make sure the scantool you use (now or future) is configured to be compatible with your Jeep. Rail pressure readings are not all the same. Dodge Cummins uses a different fuel pressure sensor than the Jeep. Weirdly, the GM DMax uses the same one as the CRD Jeep.
I think some of the Cummins may have a compatible sensor as well:
http://www.glowshiftdirect.com/white-maxtow-30-000-psi-fuel-rail-pressure-gauge.aspxThat gauge works with the Cummins and Dmax and plugs in directly inline with the rail pressure sensor wiring.
Make sure when you are reading from the OBD port that whatever device you are using is set to the ISO 9141-2 protocol