2G 1998 GSX fuel pump wiring?

[4everboosted]

I went to do a fuel pump re-wire today and also diagnose why my gas gauge does not work on my 98 gsx I bought a few weeks ago. Here's what I found under the seat...

Here's the rubber grommet..notice the wires leading to nowhere

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Here's what it all looks like. its a good bit of wire and has to hang out of the metal cover with the grommet because it cannot all fit. Only two wires go to the secondary sending unit. And only four are even coming through the grommet from the car.

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Here is the secondary sending unit. Someone cut a hole in the sheetmetal under the seat above it. It looks like there is a sensor there with nothing going to it. Not sure what that's for or why someone would need to be in that side anyway.

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I love these cars but in every dsm I have owned I am tired of finding hacked up messes from some kid who thinks he is a master tech mechanic and fast and the furious driver. Can anyone please point me in the right direction on this one? I need to find out where the cut wires go there doesn't seem to be a place for them. I'm about done with this car.

 

[4everboosted]

no one has any advice? someone has to know what those cut wires coming from the cars harness are for... And if anyone has a parts car still with the untouched harness everything from the harness coming into the harness leading to all the connecters please let me know. I'm really in a bind and need to get this figured out to do the fuel pump re-wire and I cant stand a non-working gas gauge.

 

[bryanwheat]

You just posted it less than an hour ago, give it some time. You could easily just look up a chassis wiring schematic and would already know without having to wait for anyone.

 

[4everboosted]

where can I find a chassis wiring schematic? I've been searching since I posted this for wiring diagrams and trying to see where everything is supposed to lead. I know I didn't post that long ago but like I said I'm in a bind, and also frustrated because this isn't the first thing on this car that wasted a bunch of my time for no apparent reason other than the previous owner had no clue what he was doing, yet wanted to mess with everything. If this car wasn't so clean rust wise I wouldn't have even bought it, but im this far and don't want to quit now.

 

[19Eclipse90]

See if this helps: Connector/wire identification. It lists all the wires coming through the rubber grommet to the fuel pump area on a 2Gb.

 

[farmer890]

I have a 97 GSX 5 speed with no modifications to my fuel pump wiring. Hopefully using my pics as a reference may help you.

So here we have two harnesses. One black one white. Obviously the blacks go together, as do the whites.

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The harness in the 2 pics below is the harness that is furthest to the right in the pic above. It seems to come from the driverside under the sheet metal.

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So in this harness, you have a Yellow wire, a Yellow/Black wire, a Yellow/Green wire and another Yellow/Black wire.

These 2 pics below is the harness that plugs into the one above. It has Yellow/Red, Grey/Red, Yellow, Yellow/Black, Yellow/Blue, Grey/Blue, Yellow/Black, and Yellow/Blue a second time.

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These pics below is of the white harness found under the fuel pump cover.

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This one has Yellow/Black, Yellow/Black, Thick Black, Thin Black, and Black/Blue.

Hopefully these pictures help you identify which ones you need and which ones you don't. I plan on rewiring my fuel pump but I saw your troubling post so I thought I'd throw some pics up before I go splicing away. Hope this helps. Good luck!

 

[4everboosted]

19eclipse90 and farmer90 thank you both very much. Farmer90 do you see those cut wires in my picture that go through the rubber grommet then they are just cut off? Where do yours go? It almost looks like your connectors come through your grommet. mine do not

 

[farmer890]

All of the wires that come out of my rubber grommet go into their respective pin connectors and then get plugged in to their respective harnesses so that all of them are used.

You know what I think......from looking at your pictures, and looking at my unmolested wiring, I believe that in the past someone attempted to do a fuel pump rewire on your car and got confused and failed. I think because of this failure they tried to patch it back up to its original wiring using a harness from another vehicle/harness that happens to fit but has extra wires.

All those wires that you have sticking out that go nowhere, I do not have those. Maybe the previous owner thought it would be at least a good idea to leave those lengths of wire in just in case, even though they're not needed to make the car run.

You have SO much extra length of wire than I do, that's why I think someone tried a rewire, failed, destroyed everything in the process and used make-shift parts and methods to repair everything. Just my opinion though.

 

[evo1rice]

Whoever cut the wires also cut a ground to the pump connector. There should be 5 going to the pump, 2x 16ga (black, black/blue), 2x 22ga (yellow, yellow/black), 1x 22ga (black).

Black 22ga wire is a ground wire. Most mitsu grounds are 22ga black, with dual silver strips. Find the pump connector. I bet there is still the 22ga black ground there pinned inside. If so, just reconnect the two ends.

 

[19Eclipse90]

I see the three wires for your fuel tank pressure differential sensor (black sensor) floating around in your first picture.

And if the harness you have there is from a FWD car rather than an AWD, I can account for the red and the blue with red wires from the same picture for the EVAP emission ventilation solenoid.

Then there is a single black wire that needs found. The fuel gauge unit has a black ground wire which would reason to say that is what the other wire would be for and why your gauge isn't working.

 

[4everboosted]

farmer890 your probably right. I could tell the kid had no idea what he was talking about with the car. He only had it for a few months and managed to molest every aspect of it. But a clean DSM is about one in a million here in PA, so I have just been going through everything putting it back the way it should be.

Evorice, and 19eclipse90 your saying the wires hanging out in the first picture, one is a ground for the gauge and there should be a cut black wire on the white connector for it correct?

 

[4everboosted]

also farmer 890 it looks like both your white and black connector wires come through your grommet. I only have 4 wires that come through my grommet. the other connecter is just some kind of mangled mess. Anyone know where I can get the factory awd harness.

 

[farmer890]

also farmer 890 it looks like both your white and black connector wires come through your grommet. I only have 4 wires that come through my grommet. the other connecter is just some kind of mangled mess. Anyone know where I can get the factory awd harness.

Must be some differences between 1997 and 1998 with respect to that

 

[19Eclipse90]

On a turbo FWD, all wires go through the grommet to a gray 14-pin connector. From that connector, the harness splits to a white 2-pin connector for the fuel pump, a white 3-pin connector for the fuel gauge unit, a black 3-pin connector for the fuel tank differential pressure sensor, a black 2-pin connector for the evaporative emission ventilation solenoid, and a black 4-pin connector for the joining of the ABS speed sensor harness and the fuel wiring harness.

On an AWD, the wires go through the grommet to what looks like two different connectors: one is a white 6-pin that goes to the fuel pump and fuel gauge unit; the other is a black 12-pin connector joining the rear wiring harness and the fuel wiring harness.

In the case of no ABS, the main connector after the rubber grommet will be the same size but there will be one less harness coming off of it.

So, again, it would reason to say that one of those black wires you have hanging out there should go to the white 6-pin connector for an AWD.

 

[4everboosted]

that's what I don't understand I don't have any other harness leading anywhere it goes straight to the pump and two wires go underneath to the secondary sending unit that's it. I really need to find someone parting out one of these please anyone let me know if you know of any.