Help with fuel system design for LS1 install

[JNJchev77]

Possible dumb question here, but....

If there is a fuel line and return line coming from the rails to the regulator, but there is only one "input" on the regulator, then two out (one to pump and one to return in tank), where does the return line from the fuel rail go???

Does the two lines coming from the rails need to "join" before the regulator??

First LS Swap obviously...

[MAK191]

Originally Posted by JNJchev77

Possible dumb question here, but....

If there is a fuel line and return line coming from the rails to the regulator, but there is only one "input" on the regulator, then two out (one to pump and one to return in tank), where does the return line from the fuel rail go???

Does the two lines coming from the rails need to "join" before the regulator??

First LS Swap obviously...

What year is your engine? Sounds like you have the return style fuel rail. This style has the fuel regulator built into the fuel rail. The corvette regulator is not needed for this style. The two lines from the rail just go straight back. One to the pump (either internal or external) and the other line is the return that goes to the tank.

[JNJchev77]

Originally Posted by MAK191

What year is your engine? Sounds like you have the return style fuel rail. This style has the fuel regulator built into the fuel rail. The corvette regulator is not needed for this style. The two lines from the rail just go straight back. One to the pump (either internal or external) and the other line is the return that goes to the tank.

It's a 5.3 out of an 03 Tahoe. Has two lines right off of the intake.

So no need for a regulator? I don't remember seeing any kind of regulator in the system?? What should the rails looks like?

That would be good news, could be why I'm confused about this fuel system layout lol

[ls1nova71]

Two lines off the intake or two lines off the fuel rail? , Is the second line going to the purge solenoid by chance? Can you post a pic of what you have? Be able to give you better advice that way.
Posted via Mobile Device

[chevy72blu]

Hey folks,

I'll jump in with a question also. I am finishing my budget for my LS1 swap and I'd like some advice.

I am running an LS1 our of an 02' F body, which I believe is the "returnless" style rail. I am buying a tank with an intake Aeromotive stealth efi pump from Boyd's. My plan is to run the feed and return lines from the tank to Vette regulator, and then a single feed line to the LS1 rail. I plan on using all braided hose for simplicity of install.

Approx how many feet of line did you need? I dont have the motor yet so I cant measure. Im just doing this to finalize the spreadsheet

Would this kit be a good idea, along with an extra few feet (4-5?) of -4 AN line for the return + extra straight/90* fittings? I know I will need extra -6AN fittings and clamps.
http://www.summitracing.com/parts/SUM-PUMPKIT1/

I've never messed with fuel plumbing other than carbed stuff. Braided line/fittings are new to me.

[mooseknuckles]

........

[not2oldchevy]

Top line is supply lower line is return. Regulator is in fuel rail, you don't need the vette regulator.

[chevy72blu]

Just put in an order for (hopefully) all of my stuff. Man these fittings get pricey. Im sure that I am missing a few items, but I wanted to get the bulk of it and buy more fittings locally as I need them. Im running a 98 LS1 with returnless rail

Heres my list so far:

WIX-33737 regulator/filter
Summit SUM-PUMPKIT1 -6AN kit (20ft, includes 3 adapters, 2 straight, 1 90 and clamps)
Summit SUM-230406 -4AN 6 ft kit (for return)
SUM-220490 straight end (-4an for return)
RUS-660060 3/8 NPT to -4AN (for return)
(2) SUM-220690 straight ends
(2) SUM-220687 90 ends
RUS-644123 for vette filter
RUS-644113 for vette filter
RUS-640940 for vette filter
RUS-640850 for fuel rail

Anyone see any problems?

[tallic68]

What pump are you using? If not an in line/external pump, what would be a suggestion?
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[solidaxel]

Originally Posted by chevy72blu

Just put in an order for (hopefully) all of my stuff. Man these fittings get pricey. Im sure that I am missing a few items, but I wanted to get the bulk of it and buy more fittings locally as I need them. Im running a 98 LS1 with returnless rail

Heres my list so far:

WIX-33737 regulator/filter
Summit SUM-PUMPKIT1 -6AN kit (20ft, includes 3 adapters, 2 straight, 1 90 and clamps)
Summit SUM-230406 -4AN 6 ft kit (for return)
SUM-220490 straight end (-4an for return)
RUS-660060 3/8 NPT to -4AN (for return)
(2) SUM-220690 straight ends
(2) SUM-220687 90 ends
RUS-644123 for vette filter
RUS-644113 for vette filter
RUS-640940 for vette filter
RUS-640850 for fuel rail

Anyone see any problems?

Does anyone have the cost of these items listed above.

I need to add the 87 fuel tank & sender along with the fuel pump for a 97 to this total for my 78

[JNJchev77]

Originally Posted by ls1nova71

Two lines off the intake or two lines off the fuel rail? , Is the second line going to the purge solenoid by chance? Can you post a pic of what you have? Be able to give you better advice that way.
Posted via Mobile Device

My apologies.... off of the fuel rail. I can post pics once I get home. But I am pretty sure these are fuel rail lines. When I pulled the caps off, fuel spilled out of them... They are steel lines one on top of another, pointed towards the back of the motor...

Exactly like Br3W City's first pic, post #10