Help with fuel system design for LS1 install

[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

[mooseknuckles]

........

[not2oldchevy]

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

[JNJchev77]

Thanks for the help fellas.... Here's a pic just to clarify what I have. I will list some part numbers for the fittings I use, in case any one else needs some help.

[JNJchev77]

Here are some part numbers for the "return style" fuel rails. Thanks for all the help guys!!!


Russell Performance 640850 - Russell Fuel Rail Fitting Adapters- Feed Line 3/8

Russell Performance 640860 - Russell Fuel Rail Fitting Adapters- Return Line 5/16

Russell Performance 670470 - Russell AN to Metric Adapter Fittings- each end of Walbro 255 fuel pump

Summit Racing SUM-220690 - Summit Racing® Hose Ends- -6AN hose connector with female 6AN female threads

Summit Racing SUM-230615 - Summit Racing® Stainless Steel Hose- 15ft hose using for feed

Summit Racing SUM-230620 - Summit Racing® Stainless Steel Hose- 20ft using for return.

[mudpupxxx]

This might be off topic, but I originally put my LS2 into a 2000 S10 pickup and according to the S10 forums the stock fuel pump would supply enough pressure to feed the engine with the vette fuel filter inline with it.

But I am in the process of restoring my 87 K5 and putting the LS2 in it. Can anyone tell me if I can take out the stock S10 pump and drop it into my K5?

I don't have anyone around to help me get the bed off the pickup or else I wouldn't ask.

This restoration is costing me enough and I want to save money where I can.

Thanks guys!

[JNJchev77]

For us dudes with return style fuel rails, what filter is being used?

Is there is WIX filter being used? I'd prefer that, and can I use -6AN fittings with it, push connect possibly?

If so, anyone know if they're 3/8 or 5/16??

Also, does the filter go between the tank and pump, or between the pump and fuel rail?

[BR3W CITY]

I'm using a fuel injection compatible in line filter, iirc its an Earl's. It uses regular -6 AN, no need for PTC except for at the rail. Feed is 3/8, return is 5/16.

pump->filter->engine. You can run a pre-filter, but it needs to have high enough flow to not cause issues with suction. I personally don't/.

[JNJchev77]

Thanks Br3W! I've got the PTC fittings for the fuel rail and was running my braided line and it occurred to me that I forgot about the filter lol. I will check Earl's!

Something like this?? http://www.summitracing.com/parts/TFS-23000/

[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?
Posted via Mobile Device

[mcmlxix]

I bought some 3/8 compression to -6 AN fittings off eBay.... I just had an OEM plastic clip fail on my 04 Impala at the fuel filter. Granted mine are 8 years old, but my suggestion is to pick up a few extras...



For my fuel pump I chose a factory pump for a 2005 Silverado/Sierra that is internally regulated. I am building an oversized tank, 13" deep and will be perfect for the fuel pump assembly. www.vaporworx.com makes a ring (or a kit) out of stainless or aluminum to mount the pump using the factory o-ring and cam lock. If you need a tank thats not as deep (lowered trucks,) they designed the system to use the Gen5 Camaro or CTS-V pumps...

[Bulldog88]

So I have an ls1 with no return and im going to use the stock tank along with a walbro exxternal pump, do I need to also use a wix filter or not? Also can I use braided black hose and just slide it over the sending tube and clamp it?
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[brossow]

Originally Posted by Bulldog88

So I have an ls1 with no return and im going to use the stock tank along with a walbro exxternal pump, do I need to also use a wix filter or not? Also can I use braided black hose and just slide it over the sending tube and clamp it?
Posted via Mobile Device

The Wix filter for the Corvette is also a fuel pressure regulator, which you will need. Clamping high-pressure fuel injection hose like you'd do with low-pressure fuel lines is A Bad Idea™.

Refer to this post to see what I did with my LS1.

[Bulldog88]

How do I do a return port if im using the stock tank from a 67 how do I return the fuel back
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[laynrockers]

Ok hoping to bring this thread back to life..

I have a shopping list of the following (see attached picture)

Now what fittings do i need to connect to the SS hose? and How do i make that connection??

[JNJchev77]

laynrockers....

Summit Racing SUM-220690 - Summit Racing® Hose Ends- -6AN hose connector with female 6AN female threads

Make sure to get braided line cutters so the ends don't "fray" or you'll never get the fitting to slide on....

[laynrockers]

Originally Posted by JNJchev77

laynrockers....

Summit Racing SUM-220690 - Summit Racing® Hose Ends- -6AN hose connector with female 6AN female threads

Make sure to get braided line cutters so the ends don't "fray" or you'll never get the fitting to slide on....

Thanks

[JNJchev77]

And if you have the "return style" fuel rails, you don't need that WIX fuel filter. You would want an inline filter for fuel injection.

The fuel filter is for the "returnless" rails.

[laynrockers]

Originally Posted by JNJchev77

And if you have the "return style" fuel rails, you don't need that WIX fuel filter. You would want an inline filter for fuel injection.

The fuel filter is for the "returnless" rails.

I made another thread about that as i had questioned it myself. From what i found out i have a return-less. ( 07 LY5 5.3 )

I had two fuel line going up to rails. One connects to fuel rail, the other left open right by back of block.

[brossow]

Originally Posted by JNJchev77

laynrockers....

Summit Racing SUM-220690 - Summit Racing® Hose Ends- -6AN hose connector with female 6AN female threads

Make sure to get braided line cutters so the ends don't "fray" or you'll never get the fitting to slide on....

Braided line cutter or a Dremel with a cutoff wheel and fiberglass-impregnated packaging tape. I used the latter and it worked beautifully. Wrap the reinforced tape around the area you want to cut, then slice through it with the cutoff wheel. Unwrap the tape and install the AN connector. No fraying, no investment in a tool you'll use rarely if ever again.

Something you SHOULD invest in is AN wrenches so you don't mar the anodized finish. Definitely worth the few bucks extra if you're ordering from Summit anyway.

[laynrockers]

Originally Posted by brossow

Braided line cutter or a Dremel with a cutoff wheel and fiberglass-impregnated packaging tape. I used the latter and it worked beautifully. Wrap the reinforced tape around the area you want to cut, then slice through it with the cutoff wheel. Unwrap the tape and install the AN connector. No fraying, no investment in a tool you'll use rarely if ever again.

Something you SHOULD invest in is AN wrenches so you don't mar the anodized finish. Definitely worth the few bucks extra if you're ordering from Summit anyway.

Got a dremel and will pursue that route. I always wondered why AN fittings have specialty wrenches??

[brossow]

Originally Posted by laynrockers

Got a dremel and will pursue that route. I always wondered why AN fittings have specialty wrenches??

Because they're anodized aluminum and if you try to tighten them with regular steel wrenches you'll mar the finish. DAMHIKT. Buy the Summit brand; they're cheap and well worth the money.

[68GMCCustom]

yes....get the wrenches...with 2 of the -6 and -8 AN or whatever fittings you use most. Had to install and remove some AN fittings several times and only had 1 set of AN wrenches, so if I needed two -8AN wrenches to put something together I had to use a small crescent for one side. You'd be amazed at how fast those fittings scar up when using the wrong wrench.

[brossow]

Originally Posted by 68GMCCustom

yes....get the wrenches...with 2 of the -6 and -8 AN or whatever fittings you use most. Had to install and remove some AN fittings several times and only had 1 set of AN wrenches, so if I needed two -8AN wrenches to put something together I had to use a small crescent for one side. You'd be amazed at how fast those fittings scar up when using the wrong wrench.

^^ This.