blackbyrd

iTrader: (14)

getting ready to purchase my fuel system plumbing and i got a question

you plum the feed line up to the bay and put a y block on it so you get a feed to each rail correct?

but do you only do one line for the return off the rail to the regulator or do you need a y block to run one off of each rail??

ss1

iTrader: (32)

I've found some pretty nifty diagrams on here over the last couple of years. Here are a couple of options. I think "B" or "C" are the most simple methods, and most often used.

You can either...

A: Run the feed line to a Y-block. Off the Y-block, run one line to each rail. After the rails, run a line from each rail to a Y-block, and run one line to the regulator. (I think this is what you were asking about, but seems like too much plumbing for a clean appearance)

or

B: Run the feed line to a Y-block. Off the Y-block, run one line to each rail. After the rails, run a line from each rail to the regulator, providing the regulator has two inlets, as most do. (I think going this route makes the most sense if you don't want to feed one rail from the other using a crossover)

or

C: Run the feed line into one rail, use a crossover to the other rail, then go out of that rail out to the regulator. (If you don't want to go the Y-block route)

blackbyrd

iTrader: (14)

someone also told me just run a return off one rail to the reg(no cross over) and put a guage as a cap for the other rail

ss1

iTrader: (32)

Not really recommended on higher power applications. You want the fuel to flow through the rails and into the regulator.

Do a quick search for "fuel+rails" and you'll find some pretty good information.

I saw one where Nasty N8 said he feeds into one rail, crossed over into the other, then to the regulator for applications up to 1000hp. Anything over that, he recommended the Y-block.

ss1

iTrader: (32)

https://ls1tech.com/forums/fueling-injection/777596-fuel-rails-sequence-parallel.html

https://ls1tech.com/forums/fueling-injection/640734-fast-fuel-rail-install-pics.html

Ping King

iTrader: (20)

i always ran my rails in a parrallel setup..never in series. so no cross overs for me.

Speed Density

iTrader: (38)

The LS engine is a returnless system. So your going to see a lot of people not running a feed/return from each rail.

Most guys will run a single feed and crossover then to the regulator and back. Simple and it will work fo a lot of applications.

Tony.

blackbyrd

iTrader: (14)

i dont like the looks of of a cross over but your saying people run a return off one rail with no cross over??

im not doing a cross over im y ing the feed

Speed Density

iTrader: (38)

No.

For example, you Feed the drivers side then run a crossover and then run your passanger side to the regulator to achieve your pressure. Then run the return back.

blackbyrd

iTrader: (14)

k so a feed for each rail from a y block then a return from each rail using the regulator as a y block correct

Speed Density

iTrader: (38)

Yes, that would work.

Or you can run a single feed/return and a crossover.

BlkHwk

iTrader: (8)

I don't care for the crossover look either. I did a Y then ran to the front of the rails. There is however a crossover @ the back of the rails I made out of 3/8" alum tubing and then to the reg., from there back to the tank.

blackbyrd

iTrader: (14)

im confused at how you did the back did you put a t fitting in it to run the reg off of??

but aside from that you have the cleanest fuel setup ive seen

BlkHwk

iTrader: (8)

Yep, the alum line runs from the pass. side rail to a "T" fitting on the drivers side rail. The braided line you see by the brake booster runs from the "T" fitting to the FPR. You could use a y fitting if you wanted or run one line line off each rail to the FPR also.

blackbyrd

iTrader: (14)

another question for you what did you do about your evap system im wanting to ditch it but im confused on how to do with the stuff ontop of the tank

BlkHwk

iTrader: (8)

My evap system is all still in place.

blackbyrd

iTrader: (14)

all of it or just the rear part, ive now decided that im gonna keep the stuff on the tank and let it do its job just not pumkp back into the manifold

BlkHwk

iTrader: (8)

All in place. Right now I see no reason to get rid of it. If I was building strictly a track car maybe, but since I'm not probably best to keep it IMO.