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I don't have a reference line hooked up to my FPR; but I have an issue with the ECU not handling positive pressure (NA based ECU). As such when it sees positive pressure it takes a dump in the fuel department going all the way down to 10.1:1 if not more before I have to let up because it stops climbing the RPM band (I have been able to nurse it to redline without positive pressure, so it's definitely is the ECU at fault not the FPR that's not hooked up).
But if you're running into positive pressure (more than 5PSI) you are definitely going to need to hook up the line.
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