I am sorry that I was unable to get to test the Fuel Pressure at or before the Fuel Filter to isolate the Spider Assembly yesterday as I was quite sick from working in the Cold and I think it wise that I not attempt anything until tomorrow but I will do the test tomorrow morning before 10am EDT.I am still trying to understand my issue so please bear with me, can you answer the following for me?
a. If the Pressure Is Constant after capping off the Pressure Line to the Engine
and the pressure is 62 psi. This would mean the pressure release is not associated with the Pump but a component Upstream. This goes back to my original question.
(Q1) What component maintains and releases the pressure in excess of 62 psi?b. If the Pressure is being released pre-Filter, this would indicate a leak or an issue with the pump. The problem with this is, I have released with 7 DELPHI pumps and no change.
(Q2) So the issue will be with the Pump Assembly (Module)c. When I pressurized the pump directly, the pumps holds @ 62 psi for a few seconds and then kicks down to 30 and then I can hear the Return Line dumping the fuel back into the Tank. I understand the Pressure Regulator works off the Increase Vacuum inside the Upper Intake Plenum This keeps bringing me back to the same question
(Q3) What Component Holds the Operating Pressuse @ 62 or more when increasing the RPM?It keeps coming back that there is either a component that is failing upsteam (Spider Assy, Fuel Pressure Regulator) but with me replacing the Pressure Regulator 3 times and using 2 separate Spider Assemblies (the one currently int he Truck came out of a Running Truck).... That I am missing something, another component or a leak I am not seeing or smelling....Your Thoughts before tomorrow's testing?