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Old 04-27-2010, 02:51 PM   #1
N8WRX
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Default 6AN fittings help.

Hey all, im setting up my own fuel system and i need some help finding the correct AN fittings to fit onto the stock fuel lines that come out of the firewall. Im running 6AN line to some boomba rails from the stock fuel lines that run the distance of the car. I just need the fittings for the ends of the stock lines on the firewall side. These are the lines im talking about.

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Old 04-27-2010, 03:10 PM   #2
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you arent going to find anything that directly "connects" to the lines. you will need to use a clamp fitting on the factory lines to a distribution block or something similar then to the rails.
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Old 04-27-2010, 03:16 PM   #3
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Old 04-27-2010, 03:25 PM   #4
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thanks sean, do you know if the stock lines are 3/8 tube?
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Old 04-27-2010, 03:27 PM   #5
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I believe they are 3/8 or 5/16 but your answer can be found gere:
http://forums.nasioc.com/forums/show....php?t=1382976
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Old 04-27-2010, 03:51 PM   #6
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I think the most secure connection would be to flare the end of the factory hardline, and slide on a -5 sleeve nut. Use a -5 to -6 male adapter than then run to your distribution block.

Duncan
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Old 04-27-2010, 04:44 PM   #7
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Theres a whole thread on fuel systems in this forum, it has the answer theres a fitting that will connect right on the end and convert them to 6an.
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Old 04-27-2010, 05:19 PM   #8
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Ok so i found the correct fitting to go directly from the hard lines which are 5/16 to a 6an female. My question is are the fuel dampers required? I know they make it so the injectors dont see pulse form the pump but do i need to include them? Here is a quick diagram of my setup, please comment. constructive criticism welcomed

Note: this is not EXACALLY how im routing the actual line its just a diagram

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Old 04-27-2010, 07:14 PM   #9
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You can clamp -06 line right over the factory bead rolled tube.



If the fuel feed and return hard lines from the firewall are the same as the power steering hard line, it is .390" OD and will not work with a 3/8" Versil-Flare. I tried those from Eaton and they have a max of .380" OD tubing.
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Old 04-27-2010, 07:51 PM   #10
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I know for 100% now the stock lines feed and return are 5/16. There are mutliple brands that offer a 5/16 hard fuel line to 6AN female fitting. All i really need to know now is the fuel damper required? If it is why, if not what differences will i see?
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Old 04-27-2010, 10:31 PM   #11
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Yeah I had a brain fart. Still, those Versil-Flare type fittings are finicky about the OD of the tube. Just because you can slide -06 hose over it does not mean the end and ferrule will fit over it. Measure it with a caliper before ordering the fitting and cutting the bead roll off the line.



Are far as the damper, the old cars don't have it. There might be a little more noise from the fuel system, but modified cars are rarely quiet anyways.
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Old 04-27-2010, 11:19 PM   #12
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This is the specific item im looking to get for the firewall lines to the 6AN line

http://www.summitracing.com/parts/AEI-15117

and is the damper solely for sound purpose? What exactly does it do to the fuel in the system?
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Old 04-28-2010, 12:45 AM   #13
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You need to check the OD of the tubing. Some of the metric stuff runs a hair larger than the American stuff. Just make sure before you buy the fitting.


Honestly, you don't really need it. You can use a hose clamp on -06 braided line right over the factory bead rolled inlet tube. It'll hold a 60 psi base fuel pressure.
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Old 04-28-2010, 03:57 AM   #14
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Quote:
Originally Posted by N8WRX View Post
This is the specific item im looking to get for the firewall lines to the 6AN line

http://www.summitracing.com/parts/AEI-15117

and is the damper solely for sound purpose? What exactly does it do to the fuel in the system?
It's my understanding that this part does the same job for half the price:

black: http://www.summitracing.com/parts/RUS-640863/
blue: http://www.summitracing.com/parts/RUS-640860/

Per Jamal, here:
http://forums.nasioc.com/forums/show...&postcount=178

I'm about to order a set...

Last edited by NSFW; 04-28-2010 at 04:10 AM.
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Old 04-28-2010, 10:38 AM   #15
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Quote:
Originally Posted by NSFW View Post
It's my understanding that this part does the same job for half the price:

black: http://www.summitracing.com/parts/RUS-640863/
blue: http://www.summitracing.com/parts/RUS-640860/

Per Jamal, here:
http://forums.nasioc.com/forums/show...&postcount=178

I'm about to order a set...
Yes i was going to order these but they are on back order with no ETA on arrival, the ladie i talked to on the phone said it could be months before they get anymore. I was bummed out
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Old 04-28-2010, 11:30 AM   #16
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Quote:
Originally Posted by piddster View Post
Honestly, you don't really need it. You can use a hose clamp on -06 braided line right over the factory bead rolled inlet tube. It'll hold a 60 psi base fuel pressure.
That's how I did it. Use fuel injection hose clamps, not worm gear hose clamps.



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Old 04-28-2010, 12:17 PM   #17
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Nice setup, i very well might do that instead. In my car (03 wrx base with v7 jdm swap) i only have 1 damper setup on the return line. Should I put 2 in place?
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Old 04-28-2010, 12:20 PM   #18
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Don't know. My car (06 WRX) came stock with dampers on the feed and return lines.
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Old 04-28-2010, 12:27 PM   #19
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Quote:
Originally Posted by Mechie3 View Post
Don't know. My car (06 WRX) came stock with dampers on the feed and return lines.
you have a in-tank fuel filter on your car?
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Old 04-28-2010, 01:33 PM   #20
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@ N8WRX
Why go through all that trouble, and still keep the serial feed setup.
Just use a -6AN T Piece after the filter,and another one in front of the FPR and go parallel feed.

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Old 04-28-2010, 01:42 PM   #21
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Personally i dont see why anyone would do that setup. The stock setup is the correct way, 1 flow path. If your adding a T how are you guaranteed that each break off the T or distro block is getting the exact same amount of fuel? there's no regulation at the T point. In order to flow identical the lines would have to be EXACTLY the same length and EXACTLY the same bends. I personally find a parallel setup to be catastrophic. This is why im running my own setup as most aftermarket kits are using parallel.
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Old 04-28-2010, 01:44 PM   #22
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Quote:
Originally Posted by N8WRX View Post
you have a in-tank fuel filter on your car?
Correct.
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Old 04-28-2010, 02:22 PM   #23
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Quote:
Originally Posted by N8WRX View Post
and is the damper solely for sound purpose? What exactly does it do to the fuel in the system?
My understanding is that the damper helps maintain even pressure in the line. An injector pulse momentarily causes a drop in pressure. The larger the injector flow for that pulse as a percentage of total fuel system volume, the greater the effect will be on momentary fuel pressure in the system. There will also be some pulsing from the fuel pump. More volume in the fuel lines and a good fuel pressure regulator could remove the need for the dampers.
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Old 04-28-2010, 02:26 PM   #24
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Now that im looking more into it, im confused as to why subaru put a damber on the return line after the FPR rather than put it on the feed? I can see the reasoning in dampening the fuel in the feed before it reaches the injectors but why dampen after the FPR in the return going back to the tank? the pump is just going to repump that gas and cause the "wave" effect so the return line damper is kinda useless?
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Old 04-28-2010, 02:31 PM   #25
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Quote:
Originally Posted by N8WRX View Post
Personally i dont see why anyone would do that setup. The stock setup is the correct way, 1 flow path. If your adding a T how are you guaranteed that each break off the T or distro block is getting the exact same amount of fuel? there's no regulation at the T point. In order to flow identical the lines would have to be EXACTLY the same length and EXACTLY the same bends. I personally find a parallel setup to be catastrophic. This is why im running my own setup as most aftermarket kits are using parallel.
Exactly, making the fuel split off of a distro block isn't guaranteeing exactly equal amounts of fuel leaving the split, and going to the injector rails. Liquids will follow the least path of resistance. 1 line could be 1mm longer and have a different bend to it, causing the fuel to travel the other path (being its shorter and straighter). Although your fpr will dictate the pressure in the fuel system, you have no way to know how the fuel is flowing in such setups on each rail.
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