Fuel pressure should be right around 49 PSI.

Revving in neutral isn't a real world test. There is no load on the engine, and the PCM knows that. With no load, the engine doesn't require as much fuel volume to rev out. What I am attempting to test for here is that the pump can maintain pressure, even in high demand situations. Being in neutral doesn't qualify.

 

The pump has a constant pressure, and rpms are rpms.

 

First part is accurate. Second part is not.

 

so what should the fuel pressure be at while driving. the truck is still acting up. I have noticed my positive battery cable the insulation is worn and is sparking out against the frame. When i would hit a bump the truck would run crappier. then one time i hit a bump and it ran perfect. Im hoping this is it !