Converting to -6 AN fuel line
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2004-2007 Cadillac CTS-V Performance Mods Discussion, Converting to -6 AN fuel line in Cadillac CTS-V Series Forum - 2004 - 2007; I can't stand the crappy connection between the fuel rails and the main fuel line coming up at the back ...
  1. #1
    jclayc's Avatar
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    Converting to -6 AN fuel line

    I can't stand the crappy connection between the fuel rails and the main fuel line coming up at the back of the engine. Converting to -6AN is the way to go, I think. Has anyone done this? Seems simple enough, given the right adapters... I think it's either http://www.jegs.com/i/Russell/799/641300/10002/-1 or http://www.jegs.com/i/Russell/799/640850/10002/-1 I need. Anyone know?

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    Naf's Avatar
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    Re: Converting to -6 AN fuel line

    I went to an 8-an on that...I found it better suited to compliment the FAST fuel rail

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    Re: Converting to -6 AN fuel line

    Right now, I'm not running the larger fuel rails, so I'm staying with -6. I figured out the part numbers required for LS6 fuel rails. The picture is below.

    Red circle is Russell part 640850 - http://www.summitracing.com/parts/RUS-640850/
    Green circle is Russel part 640940 - http://www.summitracing.com/parts/RUS-640940/
    I think the line is Russel part 658520 - or you could make your own - http://www.summitracing.com/parts/RUS-658520/



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    Re: Converting to -6 AN fuel line

    *sigh* More money to spend... I've got a FAST intake to go my new motor, might as well do the pimpy braided line, too. With that said, I'm not sure I like the way it loops out like that. I could see doing a 90deg fitting off the red circled adapter, then a shorter hose running straight back. But that, of course, would add a fitting with 2 more possible leakage points. Decisions, decisions...

    If someone decides to build their own hose, just be sure whatever line you buy is spec'd for fuel. Not all braided hoses are recommended for gasoline.
    '05 Stealth Grey CTS-V, Hyper Silver Linea Corse Venetos w/Continental ExtremeContact DWs (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

  6. #5
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    Re: Converting to -6 AN fuel line

    starlite NOMEX havent had an issue yet...

    Light weight and braided all in one...

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    Cadispeedster is offline Cadillac Owners Member
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    Re: Converting to -6 AN fuel line

    MikeC@Detroitflexdefense.com

    Called and this is the guy anyone needs to talk to for custom parts I was told. Have to call back tomorrow when he's in. 7am-5pm central i think.

    Fuel line and clutch line they said they make

  8. #7
    FuzzyLogic is offline Banned
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    Re: Converting to -6 AN fuel line

    I bet there's less of a problem feeding supercharged engines with -8 AN fittings and 1/2" line. AFAIK, the stock fuel lines are 1/4", meaning that a 1/2"-based system would hold 4 times as much fuel (pi*r^2 for a given length l) and exhibit less pressure drop when boost kicks in.

    http://www.russellperformance.com/mc...adapters.shtml

    (Background: some of the most aggressive first-gen CTS-V guys have had to resort to custom surge tanks to avoid fuel starvation problems when running 16+ pounds of boost through a TVS2300 or Whipple.)

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    Re: Converting to -6 AN fuel line

    Quote Originally Posted by jclayc View Post
    Right now, I'm not running the larger fuel rails, so I'm staying with -6. I figured out the part numbers required for LS6 fuel rails. The picture is below.

    Red circle is Russell part 640850 - http://www.summitracing.com/parts/RUS-640850/
    Green circle is Russel part 640940 - http://www.summitracing.com/parts/RUS-640940/
    I think the line is Russel part 658520 - or you could make your own - http://www.summitracing.com/parts/RUS-658520/
    Thanks for this.....I'll be getting this fo sho. The stock line (even though I cut off that lower bracket on the right) makes my FAST 102 look busch league.



    EDIT: Just ordered. Thanks!

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    Re: Converting to -6 AN fuel line

    I bought the parts (went with a 90deg fitting off the rail so it would point back at the firewall), but the damn fittings were leaking at both ends. This was when I was scrambling to get the new engine in the car last summer before I had to move, so I took the pimpy line off and put the stocker back on. One of these days I'll have to try it again, as it definitely looks way better than the stock hard line with the brackets hacked off.
    '05 Stealth Grey CTS-V, Hyper Silver Linea Corse Venetos w/Continental ExtremeContact DWs (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

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    Re: Converting to -6 AN fuel line

    Quote Originally Posted by AAIIIC View Post
    I bought the parts (went with a 90deg fitting off the rail so it would point back at the firewall), but the damn fittings were leaking at both ends. This was when I was scrambling to get the new engine in the car last summer before I had to move, so I took the pimpy line off and put the stocker back on. One of these days I'll have to try it again, as it definitely looks way better than the stock hard line with the brackets hacked off.
    Fffffffffffffffff......now he tells me

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    Re: Converting to -6 AN fuel line

    I imagine I just hadn't tightened the AN connections enough, but I didn't want to mess with it anymore due to the time crunch. I don't think you have anything to worry about - Naf and jclayc have had theirs on for a while, and I'm sure they're not the only ones to do something similar.

  13. #12
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    Re: Converting to -6 AN fuel line

    Quote Originally Posted by AAIIIC View Post
    I imagine I just hadn't tightened the AN connections enough, but I didn't want to mess with it anymore due to the time crunch. I don't think you have anything to worry about - Naf and jclayc have had theirs on for a while, and I'm sure they're not the only ones to do something similar.
    I hope not. I plan on doing this before the Apr 6th Caddy meet in Indy. Thread tape for the threads or no?

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    Re: Converting to -6 AN fuel line

    Negative. AN fittings seal against the angled seat.
    '05 Stealth Grey CTS-V, Hyper Silver Linea Corse Venetos w/Continental ExtremeContact DWs (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

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    Re: Converting to -6 AN fuel line

    Got some nice line and fittings to help compliment the engine covers, and now they fit perfectly on the fuel rail...

    I've got enough line to make another, or if someone wants me to make them one just message me!

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    Re: Converting to -6 AN fuel line

    Quote Originally Posted by AAIIIC View Post
    I bought the parts (went with a 90deg fitting off the rail so it would point back at the firewall), but the damn fittings were leaking at both ends. This was when I was scrambling to get the new engine in the car last summer before I had to move, so I took the pimpy line off and put the stocker back on. One of these days I'll have to try it again, as it definitely looks way better than the stock hard line with the brackets hacked off.
    I finally got off my butt and reinstalled the line, this time making sure the adapter fittings were properly tightened before I put it in. No issues on the second go-round.
    '05 Stealth Grey CTS-V, Hyper Silver Linea Corse Venetos w/Continental ExtremeContact DWs (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

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