Fuel Vapor Detection Pump Replacement - Wiring

[Dpedro8000]

I am replacing the Fuel Vapor Detection Pump on my 2006 Cayenne Turbo.  The replacement went fairly easily, but I ended up with a disconnected wire that I cannot figure out where it goes.  It’s a single red wire from the same bundle that feeds the pump and what looks to be a sensor.  It’s a clean end so it must have been connected to something.  Anyone know what it connects to?

[Dpedro8000]

A little more info, wire color was actually brown, which I believe should be a ground on this vehicle.  But still don’t see any place to connect.  

[Rick150]

There are 2 wires to the sensors, one is brown. To identify the sensor your talking about do you know the other wire color, green/brown?

[Dpedro8000]

On the wiring harness coming out of the fender, the wires go to the Fuel Vapor Detection Pump (#7) and a Sensor (#9), and yes those 2 items have multiple wires going into a plastic connector.  Then there is a single brown wire (see pic in original post) with just a metal connector.  It’s that single wire that I cannot figure out where it goes.  Being a single wire it either has to be a ground or connected to something already grounded, I think??
 

The car is still pulling pulling the P0455 fault code, which the cause was the fuel vapor leak detection pump.  
 

I can’t find a wiring diagram of that area.