Hey guys submitting this thread to FI cause im gonna be running a turbo... Me and a buddy have been trying to figure this vacumm regulator thing out! if yall could post some pics of yous this will help me out alot..... basically our concern is on my last set up i had the fuel regulator after the fuel rails which made me think i was regulating nothing! Does this regulator go before the fuel rails and then just return what is dosent need back to the tank through the bottom of the regulator? thanks

 

fuel tank >pump>line>rails>regulator>return>tank

 

wouldnt that just put full pressure of the pump on the rails?

 

Yes, BUT...
the regulator/return....RETURNS the rest of the fuel to your tank...
Simplified explanation:
If your target psi was 50 and the pump gives 55 to the rails, the regulator will send 5psi back to your tank

 

i cant clearly explain it right now, just having a hard time putting it into words, but how i told you is right!

 

The best way I could describe it is the regulator is like a dam on a river. The dam will bleed off the excess water to keep the level at the desired height. If the water slows down the water does not bleed off as fast. If it speeds up etc... Think of the river height as fuel pressure, and the main objective is to maintain that level. You can only maintain the water level accurately up stream of the dam. Does that make sense?

 

FPR before fuel rail ~ FPR limits pressure to 55psi - Injectors open longer to meet engine demand - pressure drops - FPR begins closing to raise pressure back to 55psi.

FRP after Fuel Rail ~ Injectors seeing 55psi - Injectors open longer to meet engine demand - pressure never drops as FPR reacts to keep pressure down to 55psi.

The FPR after the rail supplies a more stable fuel pressure.

Rick

 

Nice visual. Well done

Rick

 

got it! thanks guys haha it was right to begin with

Another question, would 8an line supply and 6an return be ok? and for what kinda target h/p can i get with this line size setup?

plan on running 80# injectors

PT88 on a 408, w/ a A1000 pump

 

hey guys, why does the reuglator need a vacuum line?