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fuel pump rewire

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Old Mar 11, 2018, 08:24 PM
  #91  
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I

Originally Posted by gqcode View Post
Great write up! Start the prep work should be on flex fuel at the end of this week! this is a must for E-85.
Thanx
it is a great write up but I still haven't done it to mines yet.
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Old Mar 12, 2018, 12:13 PM
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Old Mar 12, 2018, 12:14 PM
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I suggest wiring it up parallel with the factory Relay #3. Do a search on rewiring fuel pump while keeping factory dual voltage system.
Sorry for rhe confusion.

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Old Mar 15, 2018, 02:37 PM
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Thinking of using this method...

http://www.lancerregister.com/showthread.php?t=459924

anyone see any drawbacks? I feel that it is a little cleaner install. I would rather cut the wire there than at the top of the sending unit personally
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Old Mar 15, 2018, 03:38 PM
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And it appears that on usdm models that the wire that you want is white like the picture I provided based on the fact that it is white at the pump. (It is not confirmed but I am making and educated guess.....)
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Old Mar 15, 2018, 05:22 PM
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Originally Posted by dookgvr4 View Post
Thinking of using this method...

http://www.lancerregister.com/showthread.php?t=459924

anyone see any drawbacks? I feel that it is a little cleaner install. I would rather cut the wire there than at the top of the sending unit personally
You lose the low flow voltage (8V) by doing this. Your fuel pump will run at 100% (14V) when off boost. Side effect is your fuel pressure at idle jumps from 33psi to 45 or 55 psi because the return line is too small. Also, you will need to add to ground wire. Doesn't help to increase power wire and not increase ground.
By connecting there, you will lose a little voltage from the 14V at the battery. I haven't fully tested my setup yet, but I think the biggest voltage drop is going through fuel pump relays 1 & 2. Hopefully, I'll have time to check this weekend to get a better picture of where the inefficiencies are.

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Old Mar 15, 2018, 06:03 PM
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Thanks IXer

I am countering the loss of the 8v low voltage with a aftermarket fpr and drilled out siphon

I guess what I was asking is. Will I be splitting hairs between voltage drop with hooking up here vs 2 ft down the line at the plug on the sending unit?

i was comparing this way that I referenced with the original "how to"
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Old Mar 15, 2018, 07:03 PM
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Originally Posted by dookgvr4 View Post

Thanks IXer

I am countering the loss of the 8v low voltage with a aftermarket fpr and drilled out siphon

I guess what I was asking is. Will I be splitting hairs between voltage drop with hooking up here vs 2 ft down the line at the plug on the sending unit?

i was comparing this way that I referenced with the original "how to"
it will drop voltage slightly. What are your mods? If you will be close to running out of fuel, it could make a difference.
I just looked. It won't make enough difference if you want a clean install. 0.05V is nothing.

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Old Mar 15, 2018, 07:11 PM
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Make sure you install a solid 10 awg (or better) ground to the thick black wire.
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Old Mar 18, 2018, 05:57 PM
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I was wondering if I should even do a ground

andbif I definitely should.... should I tap into this wire here? Wire the relay to the "car side"? Then just ground that wire to the chassis? It wouldn't make a difference to Hook it to 10awg and hen hook to chassis would it?

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Old Mar 18, 2018, 06:07 PM
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Originally Posted by dookgvr4 View Post

I was wondering if I should even do a ground

andbif I definitely should.... should I tap into this wire here? Wire the relay to the "car side"? Then just ground that wire to the chassis? It wouldn't make a difference to Hook it to 10awg and hen hook to chassis would it?

You should do ground too. Otherwise, it isn't a complete rewire. I read somewhere that just grounding with 8 or 4 awg bumped voltage up 0.5V. You can tap that wire to keep it clean, but make sure to verify that is the correct wire before tapping it.
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Old Mar 19, 2018, 09:06 PM
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Originally Posted by 2006EvoIXer View Post
You should do ground too. Otherwise, it isn't a complete rewire. I read somewhere that just grounding with 8 or 4 awg bumped voltage up 0.5V. You can tap that wire to keep it clean, but make sure to verify that is the correct wire before tapping it.
so would I have to retune if I were to ground that wire?
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Old Mar 19, 2018, 10:01 PM
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Originally Posted by Tommyfacekicker View Post
so would I have to retune if I were to ground that wire?
Are you doing this same rewire where your pump gets 14V all the time? Or are you only adding the ground wire and keeping factory 2 stage pump power?
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Old Mar 22, 2018, 10:24 PM
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Originally Posted by 2006EvoIXer View Post
Are you doing this same rewire where your pump gets 14V all the time? Or are you only adding the ground wire and keeping factory 2 stage pump power?
i might just add the ground and keep the factory stage 2 pump power. But if I need to retune then I might just forget the whole thing.
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Old Mar 22, 2018, 11:38 PM
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Originally Posted by Tommyfacekicker View Post


i might just add the ground and keep the factory stage 2 pump power. But if I need to retune then I might just forget the whole thing.
Strictly my opinion: I think the retune is needed at the high end where your injectors are at its highest duty cycles. Although the pump will flow more once the relay switches to 14V, your low duty cycles won't be much richer than tune. For my car, I was hitting 104 IDC at about 6000-7000 RPM. With my overkill rewire, that's when my AFR dropped another 0.5 (from 10.7 to 10.2). You need to look at your tune and see what AFR it was tuned for.
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