Its actually set at 55 psi. The system is set by the fuel pump. There isnt even a sensor in the system to measure fuel pressure. That's all in the computer. I have my system set at 65 psi on the fuel regulator. We had a fun time figuring out that the computer is just told that the fuel pressure is at 55 psi. So even though im running 65 psi we tell the computer its only seeing 55psi. If not then the computer goes ape and doesn't like life.
If you need a fuel system let me know mine is looking for a new home for half the price of building one. lol