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Old 11-29-2019, 10:05 PM   #1
WolfPk
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Obsidian Black Pearl

Impreza WRX STi flex fuel question

I'm installing a flex fuel kit on my 07 sti, new fuel rails IAG v3, 1300cc injectors new lines, and removing the old metal hoses that the feed,return, and vacuum line run into, on the backside of the engine i will connect the 2 hoses to a three way and the third to the feed hose, front side hoses will also meet a three way connector and go to the return, not sure if flipping feed and return from front to back will make a difference, but my main question is what do i do with the vacuum hoses? do they still serve a purpose, if so where would i connect them? there's no place for anything else on the new fuel rails,

also the hoses running from the fuel pump to the hard lines under the car, would it be difficult to change those without dropping the tank? I've already changed fuel pumps but it looked like there was almost no room for play between the chassis and the fuel tank, is it necessary to change those as well?

any help is appreciated.
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Old 11-30-2019, 07:29 PM   #2
subi-T
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When I installed mine all I did was install the AEM E85 pump, DW 1000CC, and the flex kit.
The flex kit comes with the hoses you need which is for the feed line. From what I was told was that the other lines donít need to be swapped. Then you disconnect the TGV sensor and plug the Flex harness to that plug and the O2 harness, I used the O2 harness that is mounted on the trans under the intercooler for easier access.
I am using the Penguin tech racing kit and works real good.

http://penguintechnology.net
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Old 11-30-2019, 09:14 PM   #3
WolfPk
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At the Track

yeah i think i figured it out, im running new fuel rails so i had to rerun all three of those hard lines that come out from under the intake manifold, running new braided fuel lines for the return and feed, the hard line for the vacuum/evap is unnecessary, it only splits off under the manifold and goes to a separate system, so im just going to run another tube dedicated to that. and the fuel system will run fine like that.

are you running a fuel pressure sensor, i got the cobb fuel pressure sensor and it seems like i have to press on the end of the fitting onto the fuel feed hardline but it never really goes far enough to be sturdy, but i think it reached the seal, dont know if its intended to be like that or not??
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Old 11-30-2019, 09:46 PM   #4
subi-T
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Not sure about the issue your having with the FPR... I actually didnít run one.
Iíd upload some pics but the app lets me do it when it wants to.
Iíll keep trying
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Old 11-30-2019, 09:49 PM   #5
subaru_gc8
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Quote:
Originally Posted by subi-T View Post
Not sure about the issue your having with the FPR... I actually didnít run one.
Iíd upload some pics but the app lets me do it when it wants to.
Iíll keep trying
you didnt run a fpr? how did you keep the pressure up?
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Old 11-30-2019, 11:02 PM   #6
WolfPk
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Question

maybe he meant the fuel pressure sensor, i think you need the FPR

heres a picture showing the end thats supposed to intake fuel to get a reading,
but it never seems to get to a point where its real sturdy, it likes to move kind of freely but feels as if its got a seal.

[url="https://images.rallysportdirect.com/image/private/s--5T1ANC6E--/f_auto,t_auto_rsd_product/v1/product_images/oqms35wvr72bga3zw8tf
[/URL]
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Old 12-01-2019, 04:57 PM   #7
stoich68912
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I recently added the cobb fuel pressure sensor and it does take some effort to fully seat the adapter onto the hard line due to the metal retaining tabs. As long as it doesn't pull off, it should be in place. It will rotate easily, but seals just fine.
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Old 12-02-2019, 04:39 PM   #8
subi-T
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