Ok, so im having problems getting the fuel lines to snap on to the fuel rail. I can get them on but they wont snap and keep them from coming off. Meaning I can put them on and take them off without the fuel disconnect tool. So I thought about putting some an fittings in the fuel rail and either running parellel fuel lines to each fuel rail with a y-block or just use two steel braided lines with the an fitting and running just like stock with an external fpr. The car will eventually make around 700rw(hopefully) through an F1. What are your thoughts on these methods?. TIA


(what im leaning towards)
http://www.gmhightechperformance.com..._snow_09_z.jpg

(easy way)
http://www.gmhightechperformance.com..._snow_08_z.jpg

 

the "easy way" would be my preferd method as long as the fuel rails can support the HP you plan to make.

 

Tha rails arent the problem as people are making alot of hp with the stockers.

 

Is there a reason you need the fuel to flow through the rail before going back to the tank? I was thinking about capping off the small ends of the fuel rail and doing this:

http://www.lt1.org/other/jpg/fuel.jpg

(Pardon my poor graphics skills)

 

I am actually in the process of building my fuel system as well, using the same stuff you have there..

I am thinhking of having my -10AN feed line from the tank go into one side of the regulator, and out the otherside into a Y-block and then split into both rails with -8an line at the rear of the rail assembly, like this..

Fuel System

is this a viable option or do you think there would be a reason to have the fuel run through the rails first before hitting the regulator? I would suppose that the fuel pressure would have to be the same in thye rails as at the regulator with this routing, but if someone has had some negative experience please step forward, this would be the easiest way for me to run everything and definately the cleanest!

Chris

 

It would seem that the fuel in the rail would get heat soaked rather easily in anything but WOT running.

 

LS1 engines use a terminating style fuel rail. I think it would be more difficult to pull off with an LT1 engine. The best way I've seen is a large feed to a y block to two smaller lines to the rails. Then back through another set of lines to a 3 port regulator. You would need to remove the cross over and have the holes tig welded as well as have the fittings welded into the rails.

 

I did mine with 2 -8 in at the rear, and a pair of -6 returning from the front to the regulator. FI regulators are designed to be at the end of the line, and control the pressure by controlling how much goes back to the tank. It also allows the fuel to continuosly circulate back to the tank, helping to cool it. Dead heading it in the rails would cause it gain heat, and the regulator wouldn't work correctly.

Here is how I did mine; one of the -8 is welded, the other I was actually able to tap out the rail and thread it in.. 1/2" NPT if I remember correctly. The front returns you just remove the cross pipe, and tap for 1/8 NPT. A 1/8 -6 elbow fits in the factory crosspipe notch perfectly.

 

So what your saying is that if your using a fpr with the boost referance you want the fuel to come through the rails before it hit the fpr correct?.

 

really, it doesnt matter.

the whole system, from the pump to right before the return line is at the same pressure.

that regulator isnt any diffrent then a "regular" regulator. only it has a second hole drilled into it to act as a Tee for the other half.

 

hmmm my regulator (Aeromotive) has 2 inlets and a single outlet. You could plug one of the inlets if it was at the end of the rail, set up like a stock one, but I don't know how well it would work if you ran the regulator before the rail. Since it is designed to hold a set pressure, and return the excess to the tank, how would you run it prior to the rail?

 

really, its a "pressure" side and the return.

so you could have "fuel pump in" and "out to fuel rails" with thoes 2 ports if you wanted a dead headed setup (LS1 style)

or

you could have the fuel go into the fuel rail, the from the rails into the regulator, and the other pressure side port blocked.

or

you could have fuel feed both rails, and instead of a crossover, both go into the regulator

or
whatever... as long as the rails are on the pressure side of the regulator, it'll run fine.
now, having a looped system where the rails have fuel constantly moving is nice to prevent heat soak, but as may OEM systems have shown (GM and otherwise) theres no real consequence in the majority of situations by having the fuel dead in the fuel rails. only in extreme heat situations where the car can heat soak it becomes a slight issue. and even then, after a second of cranking, the higher EFI pressure usually lets the gas( gas as in gas aka not liquid) blow out.

 

mr dude 1,

thats what i figured as well, after looking at the newer ls1 setups where there is no return line to the tank, i figured that the fuel setting in the rail would at worst case absorb more heat then a circulated setup, but I have also heard of larger fuel pumps actually heating the tank from excessive fuel flow and pressurization through the pump, cavitaing, etc etc, so i think i will go with my intitial above high tech microsft works layout..lol and if there seems to be any negative influence from it, then i will go ahead and go the circulating route with more AN fittings at the front of the rails (which is why i would rather not do it to start with.. purely cosmetic reasons, I know, but i like a clean underhood compartment and smooth setup.) Hope vanity doesn't bite me in the ****! lol

thanks

Chris

 

I did just like Tex did. TIG'd on -8AN fittings to the back and top front of the rails and mounted a Weldon regulator on top of the intake. Here's a tip...braided line and fittings are stupid expensive. I've got about $2200 in the fuel system and that's using the company discount on parts.

 

No kidding. I built a coolant cross over tube cause the stocker wouldn't go back on when I did my heads. $86 bucks. It looks good, too bad it's covered by my new MBA fuel rail covers.