C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Racetronix fuel pump Bulkhead harness-question

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Old 05-18-2018, 04:40 PM
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1993C4LT1
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Default Racetronix fuel pump Bulkhead harness-question

Where does that ground wire sticking out go to? Yes, I called them, and those *** holes don't know. Why am I replacing it? Because my bulkhead pins had small burning signs.


Here is the factory bulkhead I removed. As you can see, there is no ground wire sticking out on this cable.


If no one knows, I'll just go to the dealer and buy a whole new fuel tree setup. It comes with everything minus the pump.

Last edited by 1993C4LT1; 05-18-2018 at 05:39 PM.
Old 05-18-2018, 07:25 PM
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confab
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Got a diagram? I'm a little confused about the colors at one end VS the colors at the other?
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Old 05-18-2018, 07:41 PM
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1993C4LT1
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They don't send you any instructions. But never mind!! Do you see the metal locking tab, 2nd pic, above letter M on the keyboard? Well, that tab doesn't fit in the harness' they sent me. Oh well, gonna go spend the money on a new fuel sending unit tomorrow.

I'll be returning everything I bought from them, minus the fuel pump

Last edited by 1993C4LT1; 05-18-2018 at 07:41 PM.
Old 05-18-2018, 07:44 PM
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confab
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Originally Posted by 1993C4LT1
They don't send you any instructions. But never mind!! Do you see the metal locking tab, 2nd pic, above letter M on the keyboard? Well, that tab doesn't fit in the harness' they sent me. Oh well, gonna go spend the money on a new fuel sending unit tomorrow.

I'll be returning everything I bought from them, minus the fuel pump
I completely agree with that and I think I would return the pump also.

It sounds like a current hog and you don't need the extra capacity, anyway.

Good Move!!!!

I will remember the name "Racetronics" because of your experience.

Last edited by confab; 05-18-2018 at 07:44 PM.
Old 05-18-2018, 07:47 PM
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confab
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PS: Mine was pretty ratty, and I replaced it with this:

Amazon Amazon

Sold out on Amazon right now, but the manufacturer was "Vans" and it is stainless.. It's nice. I've had it for about a year and it works perfectly. Maybe they're available somewhere else?

Looks good in there too. Installed with stock replacement pump.

Good Luck!

Last edited by confab; 05-18-2018 at 07:47 PM.
Old 05-18-2018, 07:48 PM
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1993C4LT1
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I'll keep the pump as long as it works(fingers crossed, knock on wood) in case I plan to up the power one day.
Old 05-20-2018, 01:18 PM
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The extra ground wire is a redundant ground. They don't tell you **** in the instructions, but it comes with two little screw-band clamps, and that ground wire slips over the end piece of one of them, then you screw the band clamp tight on one of the metal lines of the sending unit.
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Old 05-20-2018, 03:26 PM
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I figure if it's grounded, it's grounded? You can hear the pump priming. But car just cranks and cranks. Will start up with starting fluid only.
Old 05-20-2018, 04:02 PM
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Originally Posted by 1993C4LT1
I figure if it's grounded, it's grounded? You can hear the pump priming. But car just cranks and cranks. Will start up with starting fluid only.
Polarity right on the pump? Cause it could be running backwards.

You got pressure at the valve?
Old 05-20-2018, 04:22 PM
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Old 05-20-2018, 04:24 PM
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confab
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It is pumping fuel?

You should have pressure at the schrader valve if it is.
Old 05-20-2018, 04:26 PM
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For the life of me, I can't find my damn fuel pressure gauge I'll go buy another. Oh yeah, the wires were definitely sent to me wrong. Polarity was wrong. Negative wires were on the positive side of the fuel pump. I couldn't find out how to switch them. So I just broke the tab on the connector and flipped the harness, so that negative and positive will match. The above picture is showing the wires are wrong.

I'm sure it's not making pressure. Because when I push on the schrader valve, almost no fuel comes out.
Old 05-20-2018, 04:28 PM
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Well, that works too.. Just make sure they can't short together!

It should start now, right?
Old 05-20-2018, 04:29 PM
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Originally Posted by 1993C4LT1
I'll just go to the dealer and buy a whole new fuel tree setup. It comes with everything minus the pump.
Dude, you are still messing with this? I feel sorry for you.

You are doing a lot of work for "hi perf" fuel pump with "hi perf" that you really are not going to notice as a everyday driver.

I suggest going back to stock and be done with it. Time to drive your car.

Last edited by billschroeder5842; 05-20-2018 at 04:30 PM.
Old 05-20-2018, 05:20 PM
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qwiketz
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Hi all. Mine would do a similar thing when the inside the tank part was clocked wrong with the outside the pump part. It would prime but not start. Double check and triple check that the letter lined up. I spoke to racetronix which told me to check those letters and sure enough, I was off.

Did you test wiring continuity from the end to the other end of the harness?

I believe ground is redundant and I have it hooked to one of the bolts that hold the sending unit to the tank.

also, does your sending unit show the correct fuel level? Mine was not working since my setup was clocked wrong.

Last edited by qwiketz; 05-20-2018 at 05:21 PM.
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Old 05-20-2018, 06:46 PM
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I made this


With this
https://www.ebay.com/itm/1985-1986-1...item213813c3ef
and a Spectre fuel pump from pep boys. Not the thickest of metals but took me 20 minutes to install.
Old 05-21-2018, 08:25 AM
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Originally Posted by qwiketz
Hi all. Mine would do a similar thing when the inside the tank part was clocked wrong with the outside the pump part. It would prime but not start. Double check and triple check that the letter lined up. I spoke to racetronix which told me to check those letters and sure enough, I was off.

Did you test wiring continuity from the end to the other end of the harness?

I believe ground is redundant and I have it hooked to one of the bolts that hold the sending unit to the tank.

also, does your sending unit show the correct fuel level? Mine was not working since my setup was clocked wrong.
Car is showing correct fuel amount. I'll flip the intake connection that goes to the bulkhead, see what it does. If no dice, I'll flip the fuel pump connection. If nothing, I'll go back to stock.

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Old 05-21-2018, 08:32 AM
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Which pump did you get an RX pump or a Walbro? I know they force you to flip polarity on the RX pumps.
Old 05-21-2018, 09:22 AM
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Originally Posted by confab
PS: Mine was pretty ratty, and I replaced it with this:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Sold out on Amazon right now, but the manufacturer was "Vans" and it is stainless.. It's nice. I've had it for about a year and it works perfectly. Maybe they're available somewhere else?

Looks good in there too. Installed with stock replacement pump.

Good Luck!
Eckler's has them too. I got one. Pricey, but quality, with new gasket and SS bolts.
Old 05-21-2018, 10:37 AM
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qwiketz
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You have to verify the letter alignment on the outer and interior tank parts. That is the first thing to do. Have you done that yet?


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