ok i have a stock fuel rail and an aftermarket regulater the question is what is the stock psi for a 99 civic ex d16y8 manual and what is the pressure i can go to without messing stuff up? all i have for mods is an intake. thanks
with the vacuum line to the fuel pressure regulator disconnected and plugged with something (so that its not leaking air out), the fuel pressure should read between 38-46psi.