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Old 02-21-2018, 12:07 PM   #1
adam sti
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Default Fuel lines from tank

How do I go about running -6AN lines from the fuel tank to the engine bay to replace the feed/return lines
I have the rear diff and rear subframe out so I'm ready to drop the fuel tank if needed but not really sure where to go from there
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Old 02-21-2018, 12:15 PM   #2
Samurai Jack
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The fuel hard lines run inside the car, along the frame close to the doors.
IIRC, the size of the OEM fuel hard lines is 3/8".

The -6AN lines are 3/8" ID.
What are you hoping to achieve by replacing the hard lines?

You can either simply replace the hard lines inside the car or you can run the lines outside the car along the frame.

You want SS braided lines, not rubber hose, to protect the lines from damage.
You need all the appropriate -6AN fittings. What you use depends on how you plan to route the lines.

You need money. SS braided lines and fittings add up fast.
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Old 02-21-2018, 12:41 PM   #3
adam sti
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Quote:
Originally Posted by Samurai Jack View Post
The fuel hard lines run inside the car, along the frame close to the doors.
IIRC, the size of the OEM fuel hard lines is 3/8".

The -6AN lines are 3/8" ID.
What are you hoping to achieve by replacing the hard lines?

You can either simply replace the hard lines inside the car or you can run the lines outside the car along the frame.

You want SS braided lines, not rubber hose, to protect the lines from damage.
You need all the appropriate -6AN fittings. What you use depends on how you plan to route the lines.

You need money. SS braided lines and fittings add up fast.
My tuner said the ID of the stock hard lines are about equivalent of the ID of a -4an line...
I'm shooting for ~700whp with race fuel

Any preferred brands you would go with for SS line?

I'm aware its going to cost money, but what would you estimate?
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Old 02-21-2018, 01:34 PM   #4
Samurai Jack
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Quote:
Originally Posted by adam sti View Post
My tuner said the ID of the stock hard lines are about equivalent of the ID of a -4an line...
I'm shooting for ~700whp with race fuel

Any preferred brands you would go with for SS line?

I'm aware its going to cost money, but what would you estimate?
How much is costs depends on what brand and what type you use, as well as the particular length you need.
Hose is cheaper than ss braided which is cheaper than ss braided with a cover to prevent the ss braid from cutting through or rubbing through anything.

Fittings could be $10 each or $30 each, depending on fitting.
You can also buy pre-made lines w/fittings to save yourself some work.

Go take a look at Summit Racing and start window shopping::
https://www.summitracing.com/search?...raided%20lines

I just used Fragola on my PS system. High quality so I personally would only use that brand from here on out.
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Old 02-21-2018, 01:40 PM   #5
TriAxis 6
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Default Fuel lines from tank

Donít skimp on the fuel system...ever!

Last edited by TriAxis 6; 02-21-2018 at 01:46 PM.
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Old 02-21-2018, 01:44 PM   #6
TriAxis 6
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Default Fuel lines from tank

I used Fragola 6000 series PTFE hose and Fragola 6000 series fittings exclusively on my fuel system. It was ridiculously expensive. I think I have about $800 in fittings!!!

But then again, I donít have enough money to buy cheap parts!
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Old 02-21-2018, 11:29 PM   #7
adam sti
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Quote:
Originally Posted by TriAxis 6 View Post
I used Fragola 6000 series PTFE hose and Fragola 6000 series fittings exclusively on my fuel system. It was ridiculously expensive. I think I have about $800 in fittings!!!

But then again, I donít have enough money to buy cheap parts!
What size lines did you run from the tank?

I don't understand why/how you would need that many fittings ..
No fittings are needed to connect lines to pump assembly, a regular clamp can be used
only fitting are connecting the feed line to the rails , and return line to the regulator
Am I wrong?
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Old 02-22-2018, 06:10 AM   #8
TriAxis 6
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Default Fuel lines from tank

I have -6AN. Sorry I forgot to mention I did fuel rails too. I purchased the type and quantity of fittings the guys wrenching on the car told me to get. I also have a radium in tank hanging double pump 450 set up and in in line fuel filter and fuel regulator.
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Old 02-22-2018, 07:31 AM   #9
Samurai Jack
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Couple of other things:
1. Install an in-line fuel filter.
- There are filters specifically made for set-ups like this that use AN fittings
- You can mount this on the firewall near the clutch master cylinder
2. Use a one-piece line from the fuel tank to the in-line fuel filter.
- Can't stress this part enough. Minimize the potential for leaks
3. You can run from the in-line fuel filter to the rails

For my PS system, I also used the 6000 series Fragola and Fragola steel compression fittings.

You'll need clamps at the tank end.
You'll need fittings to go into and out of the fuel filter
You'll need fittings to connect to the rails

Are you installing a fuel pressure regulator?
- You need fittings for those lines too

Ever make braded line before?
Actually very simple to do. Can you use a hack saw and cut a straight line?
Fragola has instructions on their site
Youtube has videos on several different ways to do it.

As I mentioned earlier, IF you know what you need, you may be able to purchase pre-made lines with fittings already installed. The fittings are crimped on under pressure.

You can also order what you need directly from Fragola but this is not a 1-day turn-around. They custom make to order so it takes some time.
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Old 02-22-2018, 09:10 AM   #10
adam sti
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Quote:
Originally Posted by Samurai Jack View Post
Couple of other things:
1. Install an in-line fuel filter.
- There are filters specifically made for set-ups like this that use AN fittings
- You can mount this on the firewall near the clutch master cylinder
2. Use a one-piece line from the fuel tank to the in-line fuel filter.
- Can't stress this part enough. Minimize the potential for leaks
3. You can run from the in-line fuel filter to the rails

For my PS system, I also used the 6000 series Fragola and Fragola steel compression fittings.

You'll need clamps at the tank end.
You'll need fittings to go into and out of the fuel filter
You'll need fittings to connect to the rails

Are you installing a fuel pressure regulator?
- You need fittings for those lines too

Ever make braded line before?
Actually very simple to do. Can you use a hack saw and cut a straight line?
Fragola has instructions on their site
Youtube has videos on several different ways to do it.

As I mentioned earlier, IF you know what you need, you may be able to purchase pre-made lines with fittings already installed. The fittings are crimped on under pressure.

You can also order what you need directly from Fragola but this is not a 1-day turn-around. They custom make to order so it takes some time.
Oh yes I forgot the inline fuel filter.
I have assembled a couple fuel lines in order to run -6 in the engine bay.
Id like some wiggle room and for that reason I will buy the lines and assemble myself.

Thanks to everyone that replied!
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Old 02-24-2018, 08:16 AM   #11
kellygnsd
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Quote:
Originally Posted by adam sti View Post
How do I go about running -6AN lines from the fuel tank to the engine bay to replace the feed/return lines
I have the rear diff and rear subframe out so I'm ready to drop the fuel tank if needed but not really sure where to go from there
You don't need to drop the tank to install new fuel lines. The pump and lines all come out of the top in the trunk.
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Old 02-24-2018, 08:58 AM   #12
adam sti
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Quote:
Originally Posted by kellygnsd View Post
You don't need to drop the tank to install new fuel lines. The pump and lines all come out of the top in the trunk.
Too late, already dropped it
However I donít see how the lines could be replaced with the tank in becuase the lines run along the top of the tank to the frame
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Old 02-16-2019, 02:32 PM   #13
wahoo280
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Default trying to run -8an feed and -6an return

anyone suggest ways to run the lines without dropping tank? have 04 wrx wagon, and seems like no room to get the new braided lines to the pump and down the drivers side, or any side at all. also some pictures would be awesome! i cant seem to see any room to get them from the driver side cover(crossover access hole) to passenger side cover (hanger) without removing stock lines, and that appears to need to drop the tank
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Old 02-16-2019, 05:29 PM   #14
TXwrxWagon
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- OE lines are 5/16" or as said -4AN and should support 400whp

- If running in place of the OE routing you definitely want to step to PTFE otherwise all others will seep fuel vapor, no bueno inside the cabin.

- PTFE even Fragolia, will pretty much double the cost of the system for line and fittings, min 75% more far more durable ans safer, but at a cost.

- PTFE fittings require lots more assembly finesse. the kool-tools install system highly recommended

- A 10 micron filter immediately after the tank in back and then a 100 micron filter up front for best results

- Several discussions about the Perrin and similar knock off "stacked style" fuel rails calling out issues. Simple log style seem to be the favorites.

- Your 04 STI should have side feed injectors, if switching to more plentiful top feed injectors, stick with mainstream fuel rail brands. Torque Performance, Cobb, Radium, Cosworth. Aeromotive

- Fuel Pressure Regulator will want/need to be 1:1 rising rate like the OE 1 psi if increase for every 1 lb of boost. Referenced on the intake, just like stock. Lots of confusing options.

- Everything I just typed is out the window if your tuner tells you otherwise.

TRUST YOUR TUNER!!

~Rob
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Old 02-16-2019, 05:52 PM   #15
kellygnsd
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Not sure if you got your filter sizes backwards but if you aren't running a surge tank all you need is one filter on there outlet to protect the injectors. 10 micron recommended for that. If running a surge tank and external pump you want a 100 micron on pump inlet to protect the pump and 10 micron on pump outlet to protect the injectors. To much filter kills pumps and flow.

Quote:
Originally Posted by TXwrxWagon View Post
- OE lines are 5/16" or as said -4AN and should support 400whp

- If running in place of the OE routing you definitely want to step to PTFE otherwise all others will seep fuel vapor, no bueno inside the cabin.

- PTFE even Fragolia, will pretty much double the cost of the system for line and fittings, min 75% more far more durable ans safer, but at a cost.

- PTFE fittings require lots more assembly finesse. the kool-tools install system highly recommended

- A 10 micron filter immediately after the tank in back and then a 100 micron filter up front for best results

- Several discussions about the Perrin and similar knock off "stacked style" fuel rails calling out issues. Simple log style seem to be the favorites.

- Your 04 STI should have side feed injectors, if switching to more plentiful top feed injectors, stick with mainstream fuel rail brands. Torque Performance, Cobb, Radium, Cosworth. Aeromotive

- Fuel Pressure Regulator will want/need to be 1:1 rising rate like the OE 1 psi if increase for every 1 lb of boost. Referenced on the intake, just like stock. Lots of confusing options.

- Everything I just typed is out the window if your tuner tells you otherwise.

TRUST YOUR TUNER!!

~Rob
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Old 02-16-2019, 11:55 PM   #16
TXwrxWagon
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WRB not so minty fresh

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sorry.. yes... 10 micron immediately before the pump if pulling into the surge/inline... my mistake...

I run 100 micron up front after the feed lines and jsut before the split to the feed side of the fuel rails...

I knew what I "meant to say"

~Rob
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Old 02-17-2019, 06:18 AM   #17
TriAxis 6
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Iíve got a ton of Fragola fittings for PTFE hoses and Fragola PTFE hoses for sale brand new never used. Iím offering huge discounts on these new in box parts. PM me if you are interested.
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Old 02-19-2019, 03:48 AM   #18
ngreenwood6
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I have an 05 STi and am looking at doing this as well. Going to go with -8 feed and -6 return lines and run along the frame. Was wondering if anyone in this thread has pictures of where their lines are running so I can use it as a refernce.
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