Need to find wiring to and from fuel sending unit in2008 outlander

Spencer, Check all fuses ,plugs and grounding at the tank.The sending unit module, inside the GM's gas tanks were notorious for going bad in this err, when you changed it did you use a quality part? Also the fuel pump sending unit plug/wire harnesses were known issues, so much that replacement pumps would often come with replacement plug to splice into existing harness. Check the attached links,instruction and guides on how to trouble shoot fuel gauge/sending unit, Good luck
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Fuel Gauge Tech How To Properly Diagnose Faulty Fuel Pump Sending Unit
GM Fuel Pump Level Sensor Diagnosis Testing

Sorry, but fuel pump and fuel gauge sending unit are all one unit, and in the tank.! There should be 2 straps that come off, drop the tank(preferably empty) and it's out.
NOTE* disconnect all fuel lines first and disconnect battery is a safe bet too.

The most common way to find out is to test both components.
The sending unit in most vehicles grounds the gauge on the dash.
You would unplug the sending unit - pump harness at the tank and ground the sending unit wire. If the gauge climbs up to full the sending unit is at fault.
You could also measure resistance in the circuit in the tank when the tank is close to empty and after filling it up. The resistance should be different each time.

I would bet the sending unit is bad but lets check it, a good test i use is that i have a used sending unit i connect to wiring to test the gauge and wiring, if the gauge moves when i move the testing unit then i know the gauge is good and the wiring to, locte the connector at fuel tank, and unplug it, this will be the one the leads to top of the tank and the connector will be on the side be the frame on drivers side, the way you know you have the right connector will be the truck will not run as this connector has the sending unit and pump wires in it, if the gauge goes to full then you know the wiring is good and the gauge is good, you can jump the two wires and gauge should go to full also. the problem is you must get the right wires for sending unit or you may pop fuse, let me see if i can get you a wiring diagram or just do the full test by unplugging connector.

Okay, your sending unit has a yellow and white wire, thats the sending unit wire, the other is a ground and we wont worry about that. so if you want to see if gauge will go to empty or full just unplug connector and gauge will move to full then if you take a wire and jump the yellow wire with white stripe to a good ground the gauge will go to empty, the thing is your gauge is on empty so sending unit may be grounded out, good day

The fuel sending unit is bad. When they go bad they will read at different levels than what is in the tank. It could be grounding out but not likely when you remove the power wires.

you should be able to find the fuel tank harness under the car near the fuel tank. If you look just in front of the rear axle on the drivers side you will see two connectors Unplug the connector with the grey, purple, black, and black/white wires.

Ground the purple wire. Turn the key to the run position. The gauge should read full. If it does you have a bad sending unit (the part in the tank that tells the gauge what the fuel level is at).

If the gauge still reads empty you have a bad gauge.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

I think by what you have decribed is the gauge in the dash itself is bad. When the wire is unpluged the gauge should read empty. I assume that this is an older Chevy with a mechanical fuel pump being there is only one wire. You can also check to see if the sending unit in the tank is operating properly but reading the ohmn's thru the wire.

Most of the time its is the sending unit in the fuel tank. The test for it is to use a variable resistor that is hooked up to the wiring at the fuel tank and watch the fuel gauge if the gauge works ok thats makes 100% sure its the sending unit. At 245 ohms the gauge should read full, 180 ohms for 3/4 full, 160 ohms for 1/2 tank, 100 ohms for 1/4 tank and 42 ohms for empty. The color of wires at the fuel tank is purple wire and black wire. You can also use fixed value resisters. If the fuel gauge the wires from the sending unit to computer then to gauge for bad connections, shorts, broken wire and bad grounds. If the wires test ok that only leaves insterrment cluster or computer which even most dealers can't test eather one but the insterment cluster would be a more common problem then the computer. But about 95% of the time it will be the fuel level sensor in the gas tank that causes the problem. Good luck.

the sending unit in the tank has gone bad or a wire is grounded out.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

there is only one part that makes this happen, it is the fuel gauge sending unit in the fuel tank.