ok so i just got an accord with a h22a4 and it has a aem fuel rail and the psi gauge says 39 or 40. can some one explain to me how the fuel rail works? and what psi it should be at.
thanks and ill post pics of my new car after i clean it

 

im pretty sure you dont have an aftermarket fuel pressure regulator ... because oem psi is 40 psi average ... and without the fuel regulator that rail isnt really doing anything

 

The fuel rail does nothing...or that is to say it does exactly the same thing as a stock Honda fuel rail. Without an adjustable fuel pressure regulator that is all just bling.

 

o ok thanks guys