Fuel Pressure
 

i just installed my paxton fuel pressure regulator. i set it somewhere between 45psi and 50psi with the vaccum line off. i attached the vaccum line and it goes down around 35psi to 32psi. i hit the gas and it jumps up to 40psi. my car runs better than ever now. my question is that when i hit the gas my fuel pressure will go from 32psi up to 40psi or should it stay at 40psi all of the time? thanks for your help in advance.

When you set the fuel pressure with the vacuum hose off that is what the fuel pressure will be at wide open throttle.

Sounds like you did it right to me.

Later,

If you think about it it makes sense, higher rpm's equal faster combustion which requires more air, fast spark, more fuel. At idle you do not require the 40psi of fuel being dunped into the motor. To answer your question though, yes it should do this and it is good if it does, means it works!