Fuel pressure regulator goes on supply or return?
04-30-2014, 11:17 AM
#83
9 Second Club
But as Sarg also says, it's quote easy to either Y or tee the returns into a single line back to the regulator. Often it can make plumbing much neater with less hoses, and there are no real negatives to doing this.
Last edited by stevieturbo; 04-30-2014 at 11:47 AM.
05-01-2014, 01:23 AM
#84
Thank you all for the help. Things are coming along well for me. Got lines going from the tank up to the back of the intake using the y block. I'm not gonna y the the lines going to the regulator from the rails. Just gonna put them in two different ports. Then I'm gonna plug the feed and the extra so called "outlet" port and run my -6 return.
03-13-2016, 12:32 PM
#85
Your way of doing it can be dangerous. Aftermarket fuel pressure regulators should be hooked up after the rails. Meaning pumps to rails then to regulator/return. Its dangerous because you could realistically consume all of the fuel before it reaches the back of the rail. With the regulator after the rails, it will just return any unused fuel to the tank. You are right when you say the pumps will just pump what they can but you might be consuming almost all of it at full load. Your setup may have trouble keeping those rear injectors full of fuel.
I have -8an from my pumps to my passenger side rail. -8an from passenger to driver side rail. then i exit the back side of the driver side rail with -8an and go to my regulator. I capped the second port on the regulator and run a -6an return line from the bottom of the regulator back to the tank.
I have -8an from my pumps to my passenger side rail. -8an from passenger to driver side rail. then i exit the back side of the driver side rail with -8an and go to my regulator. I capped the second port on the regulator and run a -6an return line from the bottom of the regulator back to the tank.
but i also have a stock ls1 rail,,so maybe buying fuels rails just to make sure i have enough fuel
03-13-2016, 01:45 PM
#86
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I'm working through this on my car as well. I need to upgrade my rails but have no clearance on the passenger front for a crossover due to my alternator. I am thinking about running a -8 feed to the regulator -8 out to splitter and feed both rails from the rear with -6 lines. I would have a guage in the car to monitor rail pressure on the drivers side rail. It's either that or find a different alternator relocation bracket to get the clearance for a crossover but that's another couple hundred... If I am reading the pressure at the end of the rail on the drivers side can I assume the passengers side is the same? Not looking to make crazy power (~800 rwhp).
03-13-2016, 04:30 PM
#87
9 Second Club
I'm working through this on my car as well. I need to upgrade my rails but have no clearance on the passenger front for a crossover due to my alternator. I am thinking about running a -8 feed to the regulator -8 out to splitter and feed both rails from the rear with -6 lines. I would have a guage in the car to monitor rail pressure on the drivers side rail. It's either that or find a different alternator relocation bracket to get the clearance for a crossover but that's another couple hundred... If I am reading the pressure at the end of the rail on the drivers side can I assume the passengers side is the same? Not looking to make crazy power (~800 rwhp).
If you really wanted full flow rails, you could weld a fitting onto the side of the rail at the rear to allow a return line as opposed to the rear of the rails.
03-14-2016, 11:02 PM
#88
And I'm no engineer, but I just can't see the way oscs had/has is (the way I'm switching to) being a problem. This is why, I believe the pressure everywhere in the entire system will be the same. Ex: the pressure right after the pump and at the very end of the dead headed rails. Just like pressure inside of an air compressor is equal everywhere. And saying you're going to run out of fuel with it one way vs another also makes no sense. The orientation of the lines does not make a pump flow more volume. Just my observation.
03-21-2016, 04:23 AM
#90
9 Second Club
Whether you feed front, rear, middle really doesnt matter.
it is still always best to have full flow rails, but it will work other ways and if you're monitoring pressure at the furthest dead end, you should be well covered.
