Hi,
Yes, I did post this question on Car talk as well.
Sorry, I did not get a chance to find the exact location of the sensor. And it seems the procedure is complicated on getting this replaced.
Are there two level sensors on the tank, one main sensor and one sub sensor? I have downloaded the diagrams from the 1stsubaruparts.com site and it did not reference any temp sensors but it has two level sensors. It seems one is the wiring(main) and one is the sub (attached to the fuel tank). I don't have the shop manul to compare to so I don't know if this is correct or not.
It seems this might be a trip back to the dealer...