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Old 11-08-2009, 07:03 PM   #1
a143gsxr
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Default Bypassing fuel pump voltage controller??

ya'll take a look at my thread please...

http://forums.nasioc.com/forums/show....php?t=1879614
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Old 04-03-2010, 05:39 PM   #2
reddevil
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bump?
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Old 04-04-2010, 12:22 PM   #3
arghx7
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just bypass it. cut that bitch out. as you've said, it's common to bypass the fuel pump controller on other cars. Granted, the Subaru system is a little more advanced than what you'll see on a 20 year old import with a resistor relay, but once you get more modified the fuel pump controller can be a pain.

from the factory fuel pump speed control is used for:

1) reducing noise (Whinebros are pretty loud)
2) reducing wear on the pump
3) reducing evaporative emissions by cutting back on the amount of hot fuel recirculated back to the tank

those are all valid reasons to have fuel pump control, but for a lot of us they're not super important. I've never done it on an '08 STi so I can't tell you what you may run into, but be mindful that this won't necessarily solve whatever problems you are having. Just don't wire it up to ignition power, that's ghetto.
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Old 04-08-2010, 11:04 AM   #4
240sxguy
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I wired a relay in, and used the stock fuel pump controller to trigger the relay. Everything works just like stock, and its pretty easy to reverse if I want to. All the power etc.. is right there.
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Old 11-16-2010, 01:00 PM   #5
bettyblue
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bringing this one back.. i just did a fuel pump in an 06 sti and i think i fried the fuel pump controller because the relay under the glove box is clicking but the pump wont fire up anyone have any expertise?
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Old 12-10-2010, 01:07 PM   #6
mpiotro
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Using fuel pump controller to power a relay...

Will relay stay closed when factory PWM is only 33% duty cycle?
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Old 12-10-2010, 08:33 PM   #7
hectowrx
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how you do this and if this keeps working if you have a stand alone like hydra?
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Old 07-24-2012, 10:17 AM   #8
jayblizzo
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is it safe to use the stock positve that goes to the pump to power up a relay?

btw my fuel pump controller doesnt work.
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Old 07-24-2012, 01:56 PM   #9
banshee04
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I put this together a few days ago.

http://forums.nasioc.com/forums/show....php?t=2382384
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Old 07-24-2012, 02:08 PM   #10
jayblizzo
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Quote:
Originally Posted by banshee04 View Post
I put this together a few days ago.

http://forums.nasioc.com/forums/show....php?t=2382384

i already did this, but now my fuel pump controller doesnt work so i had run a ground to the pump for it to work.

will the positive voltage fluctuate when the controller doesnt work?
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Old 07-24-2012, 02:14 PM   #11
banshee04
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If the controller isnt working/bypassed and the pump is hard wired, then the pump will be at 100% all of the time.
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Old 07-24-2012, 02:15 PM   #12
jayblizzo
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Quote:
Originally Posted by banshee04 View Post
If the controller isnt working/bypassed and the pump is hard wired, then the pump will be at 100% all of the time.
that is what i am looking to do
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Old 07-28-2012, 06:09 PM   #13
scoobyman83
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Quote:
Originally Posted by jayblizzo View Post
i already did this, but now my fuel pump controller doesnt work so i had run a ground to the pump for it to work.

will the positive voltage fluctuate when the controller doesnt work?
I'm pretty sure that if your fuel pump controller isnt working and you wired your pump according to banshee04's instruction, your fuel pump will not work either, because the relay used in his instructions is activated by voltage sent from fuel controller.

To bypass fuel controller completely, you just need to use a new wire, that gives voltage when your ignition key is turned on and you use that wire to activate the relay. I'm pretty sure that you can re-use the wire that goes from the fuel pump relay to fuel controller.

However, once you turn your ignition key, your pump will be on 100% of the time, even before you start the car.
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Old 07-29-2012, 11:51 AM   #14
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Quote:
Originally Posted by scoobyman83 View Post
I'm pretty sure that if your fuel pump controller isnt working and you wired your pump according to banshee04's instruction, your fuel pump will not work either, because the relay used in his instructions is activated by voltage sent from fuel controller.

To bypass fuel controller completely, you just need to use a new wire, that gives voltage when your ignition key is turned on and you use that wire to activate the relay. I'm pretty sure that you can re-use the wire that goes from the fuel pump relay to fuel controller.

However, once you turn your ignition key, your pump will be on 100% of the time, even before you start the car.
Ok, scrap that.

Bypassing the fuel controller in the fashion i described will not work.

I found the power wire that goes from fuel pump relay to fuel controller and i found the power wire that goes from fuel controller to fuel pump, however, disconnecting the fuel controller and connecting those two wires together without the fuel controller itself, will not prime the fuel pump.

Last edited by scoobyman83; 07-29-2012 at 12:07 PM.
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Old 07-29-2012, 12:46 PM   #15
banshee04
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Which wire did you connect? On this diagram, the black and yellow wire from the fuel pump relay is the trigger wire going into the fuel pump controller, and then the fuel pump.

So it looks like you need to remove the stock fuel pump relay and wire your own in. I would us all the factory wire except I would still run a 10ga wire to the relay insted of that small factory stuff.

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Old 07-29-2012, 05:11 PM   #16
scoobyman83
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I managed to figure out what my problem was, i did not notice that the fuel pump is using fuel pump control module's ground.

Which car is this diagram for btw ?
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Old 07-29-2012, 05:30 PM   #17
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Banshee, would you by any chance have a diagram for a 2006 impreza sti ?
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Old 07-29-2012, 09:26 PM   #18
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Quote:
Originally Posted by scoobyman83 View Post
I managed to figure out what my problem was, i did not notice that the fuel pump is using fuel pump control module's ground.

Which car is this diagram for btw ?
Quote:
Originally Posted by scoobyman83 View Post
Banshee, would you by any chance have a diagram for a 2006 impreza sti ?
This diagram is for a 2004-2007 WRX/STi
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Old 07-30-2012, 03:34 AM   #19
scoobyman83
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Thanks, for some weird reason, the colors on the diagram do not match the colors on the plug for my control unit.
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Old 07-30-2012, 11:22 AM   #20
banshee04
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Quote:
Originally Posted by scoobyman83 View Post
Thanks, for some weird reason, the colors on the diagram do not match the colors on the plug for my control unit.
What year is you car?
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Old 07-30-2012, 05:02 PM   #21
scoobyman83
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2006 wrx sti
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Old 07-31-2012, 10:56 AM   #22
scoobyman83
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Here is my controller and plug

The colors are: black, white, black, purple/white, green/red, black/yellow.

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Old 07-31-2012, 11:07 AM   #23
jayblizzo
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Quote:
Originally Posted by scoobyman83 View Post
Here is my controller and plug

The colors are: black, white, black, purple/white, green/red, black/yellow.

is there a black and orange?
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Old 07-31-2012, 02:02 PM   #24
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No, they are colored exactly as i listed them and as you see on the picture.
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Old 07-31-2012, 02:28 PM   #25
smitty5788
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Jay, that is not an 08+ controller, our wires are not the same colors.

This is the plug to the controller on the 08+


Last edited by smitty5788; 07-31-2012 at 02:37 PM.
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