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Old 09-03-2011, 12:07 PM   #126
Scooby Guru
Member#: 10108
Join Date: Sep 2001
Chapter/Region: TXIC
Location: Lake Travis, Austin, TX
07 STI
60Trim spun rod bearing


Originally Posted by newblue View Post
For everyone who did this with top feed and needed an adapter, how did you route the line from the adapter to the rail? I have an gimmick silicone inlet and It seems to route the injection hose I will have to have a very long hose go above the inlet to the line so that it doesnt kink. Anyone have some insight on this? Will the extended hose be a problem?
Over the top of the intake manifold. I zip tied it to stay in place with proper hood clearance. I have rails now and run a long line to the distro block and relocated FPR (on top of the dogbone) for the air pressure line (which stock is right next to the fpr on the rail). It seems like a long line to reference 1:1 rising rate fuel pressure, but it works just fine. Also, the return line is rather long from the FPR because it has to take a U turn over the turbo. Still, it works just fine.
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Old 09-03-2011, 04:00 PM   #127
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Member#: 115019
Join Date: May 2006
Chapter/Region: SWIC
Location: nv
2002 Impreza WRX


Perfect, appreciate the feedback gabe!
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Old 03-30-2012, 11:28 PM   #128
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Member#: 199635
Join Date: Jan 2009
Chapter/Region: RMIC
Location: Provo, UT
02-4 rSTI


Im doing this now, but converting to top feeds and topfeed tgv's in the process, stock wrx rails, sti fpr.

A note, make sure the total length, ie metal line on fuel rail and soft fuel line, is the same for feed and feed on both sides and return an ld return on both sides, 02 wrx rails the passenger rail has a significant ammount of extra metal fuel line to run through than any of the others. Ill take measurments when im done for an easy diy
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Old 04-16-2012, 12:48 PM   #129
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Join Date: Aug 2011

Thank you very much for the detailed pics and your work. It's much appreciated!
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Old 05-08-2012, 07:13 PM   #130
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Member#: 237145
Join Date: Feb 2010
Chapter/Region: SCIC
Location: 562
02 WRX
12 FXT


bump! any update for how the fpr is done and connected for a WRX?
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Old 10-03-2012, 04:06 PM   #131
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Member#: 97043
Join Date: Sep 2005
Chapter/Region: TXIC
Location: Tomball Tejas
08 STI
02 Z28 - project


bump for my own reference :P
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Old 11-16-2012, 11:16 PM   #132
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Member#: 230364
Join Date: Nov 2009
Chapter/Region: MAIC
2004 Sti


What size line is on the fpr. It's never mentioned and I doubt the stock one is long enough?
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Old 07-12-2013, 07:27 PM   #133
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Join Date: Sep 2012
Location: Nova


After much reading I'm still confused so maybe an Internet engineer can explain this to me. As far as fuel lines to/from the rail (parallel setup), I have read that some believe that they need to be equal length. It seems that the fpr will create the same amount of pressure for each return line regardless of length so long as the line doesn't run dry, but in that case the motor would be well past blown up. Someone drop some knowledge.

Edit: I realize there will be no hard data unless someone has a 4 wideband setup but hopefully someone knows a sound and proven engineering theory that would apply.

Last edited by Ishart; 07-12-2013 at 07:35 PM.
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