Another gas gauge thread...

[Mr_Shamrock]

I have seen a few, but none doing exactly what mine is. Basically the needle points at full or a little beyond and then when the key is turned on it moves to 3 o'clock (way past full). I looked under the truck since many threads say to check the ground at the tank. There was a purple wire grounded to the inside of the frame just under and to the front of the tank. I'm not sure if that is for the sending unit, but I went ahead and removed it, cleaned it, and reinstalled it with no luck. I also cleaned the one that goes to the filler neck - just because. Any advice before I pull the cluster????