Fuel Pressure 502 mpi?!?!?!?
 

I have a question about fuel pressure on my 502 mpi, I have the mechanical pump hooked up to a electric fuel pump thats ran into the fuel rail. What pressure am I suppost to have at the schroder valve at the front of the motor, I only have 38 psi, and when you rev the motor, it drops to like 28. I believe that this is the propblem with my motor, not being able to rev over 2800, cause the computer is shutting it down and goin into guardian mode.. I heard that its suppost to be 46psi?? But is that at the valve? What fuel pump should I use to get the needed 46 psi??

Thanks!!!