lt1 single plane intake
The best way is to use a FPR with a bypass outlet on it. You'd put the FPR on the 2nd rail (remove the plug it has on it now), set your pressure, and use the bypass outlet as your return line. That way there is always EXACTLY what pressure you set it at, on each rail. If you put the regulator before the rail when you go wide open throttle, you will experience a tiny drop in pressure before the system reacts, because the system will have no way of stabilizing what actually happens after the regulator.
Map sensor
Fuel pressure reg
A/c-heat door control
Vented opti if you have one.
Brakes
And that elbow on there aint gonna fly, goona kill the power in that car.
The easiest way to run your regulator as it sits, is like I said before. Put it where you have the plug on the pass. fuel rail. Your FPR probably has 2 inlets and 1 return. One inlet will attach to the rail, the other is plugged and the return goes back to the tank.
As far as running the FPR on the feed, LSx f-bodies and Vettes all run the FPR in the tank on the feed line and just terminate at the rail like what you currently have, so it's not the end of the world.
Personally I would want to run the rails parallel, meaning you would run two feed lines to the front or back of the rails and then exit the rails into the 2 inlets on your FPR and the return would go out the bottom.
Here is a picture of one with a rail mounted regulator. My setup will also be like this.
The Best V8 Stories One Small Block at Time
Here is a picture of one with a rail mounted regulator. My setup will also be like this.

also look how my fuel system is plumbed. Two 8AN lines to the back of the fuel rails fed by a single 10AN that comes from the tank. Fuel press regulator is fed on each side by the rails exit (hard mounted to rails on dvr side, 6AN line from passenger side).... FPR has a return out the bottom. 6AN back to the tank..... even pressure in both rails and not prior to entry into the rails.....

The only vacuum i'm using on this is for my remote mounted MAP sensor.... i mounted it on the firewall and i pull vacuum from a port on the back of the Throttle body. The other two are capped as is the big hole in the intake.
500 t0 600 dollars i realy cant spend right now but i will keep it in mind i also like that look to
believe me i don't care if you screw em in with a monkey wrench and your fat uncle is jumping up and down on the end of it, you are gonna crush the fitting long before you split the rail..... just use a liberal amount of thread sealant and go until you're sure they are tight.....
believe me i don't care if you screw em in with a monkey wrench and your fat uncle is jumping up and down on the end of it, you are gonna crush the fitting long before you split the rail..... just use a liberal amount of thread sealant and go until you're sure they are tight.....
like i told someone else the words "my money is getting low" and "I also have twin turbos for it" should never be in the same sentence...










