Mark IXZD 150

iTrader: (1)

I was going to have my tube frame fabricator go ahead and bend all my brake lines and fuel lines for me before I pick it up. I've read that the LS1 is a one-way fuel system even though its fuel injected. I though that FI always needed a return line...

I have a 2002 LS1. I noticed that S&P offers special single or dual line fuel lines. What's the deal? I need to know. I may be able to save some money and have only one fuel line run. Does the fuel cell or pump have any say in how it works or is it all in the fuel rails - whether its one way or two way?

67ls1CamaroProject

The search would give you plenty of answers.....

Yes, you need a fuel return. The single style rail has the return line back in the tank.

For most hybrid user's like myself, we get a regulator with a return port and mount it back near the tank and have a very short return line.

You could go for the dual rail (return) setup, because people like to keep their fuel as cool as possible. That is up to you.

LS1swap

Yes and no...... The fbodies had the regulator in the tanks so if you used its pump and regulator from the donor you would not need a return. The 99 and on vette used a regulator/filter which you could mount near the tank, and once again you would need no return. The 97-98 vette was the only ls1 with the regulator on the rail its rail pn is12556705. With that you will need a return. Or if you used an after-market regulator mounted in the engine compartment you will also need a return, but once again that could be mounted near the tank as well. Just depend how you plan to plumb it.

Steve1969LS1

iTrader: (1)

Just do what I did Mark.. use a 99+ vette fuel filter/regulator and mount it back by the tank.. then return to the tank off that one.. this way you only have to run one line up to the engine. Cost of the regulator/filter is about $150 with all the fittings..

Call me and we can discuss what you need.. its pretty easy the way im doing it

67ls1CamaroProject

Call it what you want, but you still need a return line. With the reg/filter from the vette there is a return port which must be piped back to the tank, hence a return line is needed. If it is part of that in tank setup there is still a return port on it, but it just goes right back into the tank where it is mounted already. SO, all systems "return" fuel to the tank.

By the way, I paid $31 for that regulator/filter vette combo from gmpartsdirect.com and about $18 in AN fittings. You could use screw type hose clamps for pennies if you wish.

LS-1st-Gen

Just like everyone else is saying, the vette regulator is pretty much the way to go. Running 2 feet of return line is much easier than 12 feet. I got mine for about 40 bucks from the dealer, and had a gigh pressure plumbing fitting shop flare the AN end on for me.

-Gordon

Mark IXZD 150

iTrader: (1)

I wish I knew what it looked like so I could understand what you guys are all talking about... any pic?

Pro Stock John

iTrader: (34)

Mark, not sure if you can make out my fuel system in this pic:

https://ls1tech.com/psjpics/griffinpics/griff3.jpg

I would get custom fuel rails, braided line, and a sumped gas tank with an external fuel pump. You also need a regulator.

Running an intank fuel pump like stock is not necessary, so why deal with that stuff. Stock system is a pain.

I am running -10 to the front, SSRacing billet rails, -8 crossover IN THE BACK, and a -6 return. In my case I am running a Weldon 2025 pump and a Weldon regulator. You don't need anywhere need the amount of fuel pump that I have.

If you wanted to make it more racy you can make it so that you have to switch on the fuel pump from inside the car. I did that with my fuel pump and my pcm. I also have a separate switch to arm my line lock.

Speartech

iTrader: (14)

Here it is. The fuel pump feed and return are on the left, the out to the fuel rail is on the right. Now just imagine mounting this ANYWHERE on the car that you wish, and making the appropriate lines reach.
This is plumbed with the GM quick connect fittings.

This is on a 2002 LS1 with 3,300 miles getting ready to go to it's new home!

Keith

Speartech, where did you get the connection for the output(big) end on the filter/regulator combo?

Speartech

iTrader: (14)

I just make them from junkyard fuel systems. I just put a light flare on the end for hose retention.

Keith

Cool deal, thanks a lot!

Mark IXZD 150

iTrader: (1)

Don't rubber lines expose you to potential fire problems? I thought fuel lines should be metal.

Poltergeist

You have to use a little rubber. It allows for flexing of the body/motor etc. The idea is usually to use as little as possible.