Originally posted by "Levi"
I was told that the fuel pressure is controlled by a regulator on the return line to tank. This regulator is controlled by the ECU.
Is this correct for a 2001 GT?
Also would you need a RRFPR for a blown application? Or is stock good enough?
What is the max HP the stock fuel setup can handle before it starts to runs lean?
Mustang23 is correct, the regulator is controlled by the PCM and delivers just enough fuel based on the engine parameters. The returnless fuel system is on 99 to present mustangs.
I believe that once you get close to 400hp, you will tax the stock pump. there are a few ways around this. Steeda now makes a dual pump for the returnless system, i believe it is good to 700hp (but i dont have a catalog around me so i cant confirm...check the website). the other option would be to convert to a return fuel system, which should be fairly easy. I have a 99 motor in my 98 car and am using the 98 fuel system (not to mention coil-pack ignition) with a return.