I'm wondering how much change you guys see in your fuel pressure from idle vacuum to no vacuum. I always understood that the job of the FPR was to keep the pressure drop across the injector constant. With mine, I am only seeing the pressure drop by about half as much as the vacuum I apply to it. I don't know if it's critical to have this 1:1 ratio or not. I'm also not sure if it is because I modified the stock regulator to be adjustable.

Thanks

 

Hmm.. I figured somebody had made a fuel pressure measurement at idle sometime.