Hi again guys.

My LS2/t56 combo from a 2006 GTO is slowly getting closer being transplanted into my -89 IROC.
During this week i finally got the engine bay painted bright white with clearcoat on top of it. The result came out quite good I think.

So now I have to "find" a f-body oil pan for it before I can mount the engine to the K-member, which I just recently got sandblasted and painted semigloss black.

I have a (to me) big problem now in the near future that I really could need some help with, the fuel system design.

This is what I have:
-89 Iroc that originally had the L98 TPI
2006 GTO LS2 engine
4:th gen plastic tank (with its stock pump)

So what do you guys think would be the best way to go?

How should I do this system, can I use the corvette C5 filter with the short return from it to the tank?

I seems the LS2 does´nt have a return line from the fuel rails, how is the return routed on the GTO´s?

Anybody knows any suitable adapters from the quick connect fittings at the fuel tank to the stock fuel feed line, that I hope I can use?

Part # for suitable adapters/fittings that I will need to get everything hooked up?

Is the LS2 supposed to run the same fuel pressure as the LS1? 58psi?

I plan on cutting an opening in the trunk floor for easy access.

I really hope you can give me some good advice on how to make this work, and be safe, don´t want this to be a ticking firebomb...
I´ve read just about most things I manage to find about this subject here on TGO, but most things are about the LS1 engine, which seems to have a bit different fuel system.

For you interested, you can check out my progress at my page www.nordiccamaros.se
Go to "Iroc-z" and then go to "Gallery" and you should find it.

 

I have an 06 LS2/T56 in my car and I used the corvette filter with the short return. For the fuel lines, I made my own using russel fittings. Someone, I think 57kid but I'm not positive, has an excellent diagram that shows what fittings to use, including part numbers. I'll try to find it for you. I used my stock fuel tank and swapped in a Walbro 255 fuel pump. I've had no problems thus far.

 

I just realized you said you were using the LS1 tank. It has an internal regulator so you wouldn't need the C5 filter/regulator. You just have to connect the feed line to the fuel rail and I think you'd be good, but hopefully someone who's actually gone that route can chime in and verify that I am or am not full of crap on this.

 

Sounds really cool that your´s is running fine. I really miss driving my Camaro, not just working on It....I would really be sweet if I wouldn´t need to use the corvette filter and just hook up the tank to the stock fuel line, but how do I do with the return line in that case?
I can´t just leave it "open" on the tank.... Anyway, this is how my enginebay looks like now when I finally completed the filler/painting process.

 

Thanx for you Ideas sarge. Yeah It would be really nice if someone with experience in this specific area could help me out a little. I´d like to start building the new fuelsystem now, but there are just so many different ways to go, that I´m just not sure about anything anymore....Don´t know what to do at all. I know that I would like to use the ¤:th gen plastic tank because of the tube the pump lies in would hopefully help solve my fuel starvation problem that I had with the 3:rd gen tank.

And as said before, what/how should I do with the return line? Can I somehow remove the fuel pressure regulator from the tank and use a corvette filter instead? So that I can get a functioning return system, or are there smarter/better way for this?

 

Since you have a 4th gen tank, you might as well use the built-in return regulator. Either way, the return comes right after the filter outlet, so you don't have a return line up at the engine.

I'll repost my pics. I started out with a carb car (no in-tank electric pump, so no in-line fuel filter), so I ran all new fuel line to keep it simple.

I used a 3rd gen filter. The left side is the supply, the right side the outlet. The line on the outlet tee that curves back to the left is the return to the 4th gen tank. The other line goes to the engine.




Since you started with a TPI engine, you can put a tee fitting in the outlet of the filter and splice one leg to the engine supply, and the other to the return line (and remove the part of the return line forward of the filter that goes to the engine).

The other option is to keep all the fuel lines you have, and put a return-style pressure regulator in the engine compartment. You will need to gut the pressure relief valve in the 4th gen tank pick-up return port if you go that route.

If you use the Corvette filter, you'll have to buy the disconnect fittings and splice them into your supply and return lines. And gut the relief valve in the 4th gen tank pick-up. More expensive, and probably unnecessary. If you used your 3rd gen tank and TPI fuel pump, that would be a good option, though.

 

Thanx for all those good ideas and options. Yeah I bought the plastic tank from the same company in Cleveland that I got the engine/tranny from. The ONLY reason that I feel that I need to swap out stock tank is that I´m building my car as a sort of "corner carver" and the engine stalling in every corner whenever I´m under 1/4 tank pisses me off.
So I´m starting to think that I´ll go with the stock 3:rd gen filter and make a T after it and from there run one line back to the tank, just like in your picture. Do you know any part numbers or so of fittings/adapters that connects to the plastic tanks "quick connectors" (plastic pipe on the tank) and converts into maybe AN size fitting suitable for the fuel line on the other side? One for the feed pipe and one for the slightly smaller return side?