Do you have any codes set or stored relating to fuel pressure?Maybe some of this will be of some help to you?
It explains how this device operates. If you are having low fuel rail pressure problems, it can be caused by quite a few different things including the fuel rail pressure sensor, fuel rail pressure solenoid, Cascade overflow valve on top of CP3, and Fuel Quantity Solenoid on back of CP3 injection pump.
Lack of adequate fuel flow to the CP3 can also cause improper fuel rail pressure. If the CP3 cannot get the required amount of fuel, it cannot build the fuel rail pressure as needed.
A bad fuel injector,leaking, can also cause low pressure problems.
Everything thing must be ruled out one at a time to find the problem. Either you are not getting enough fuel or something is dumping (losing) the fuel rail pressure. It could also be an electronic control issue causing it? This is not an easy one to diagnose unfortunately!
Quote:
Fuel Rail Pressure Too Low
• Air in Fuel System
• Fuel Delivery System Concern
• Fuel injectors
• Fuel Pressure Solenoid
• Fuel Pump
• Fuel System Contamination
• Fuel System Leak
For a test: You could disconnect the hose from the fuel return line plastic block and see how much fuel is being returned to the fuel tank. If it is a lot of fuel, then you must determine by disconnecting each item one at a time and find out if it is coming from the fuel pressure solenoid, the CP3, or a fuel injector.
Watch this video testing the Fuel Rail Pressure Solenoid (regulator):
https://www.youtube.com/watch?v=tqW1dNp ... Automotive
_________________
Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve