VP 5.7GXi-HF fuel pressure

[HiWard]

Having recently cleaned the fuel injectors (and changed the o-rings), I was testing today to inspect for leaks.
I hooked up a gauge to the high-pressure side on the fuel rail and turned the key to the on position without starting the engine.
The pressure jumped instantly to the expected 50psi, but fell down to 40psi within a few minutes. Is this expected or should the system hold pressure? No leaks were observed.

 

[alldodge]

Taking a few minutes to go from 50 to 40 psi would not concern me

 

[ESGWheel]

While you are doing this service, suggest paying attention to the pressure regulator as well. See this service bulletin (link) regarding the replacement of the screen with an “E” clip. And see this thread for that link.