voodoo fuel gauge

So I finally got this db put back together and now the fuel gauge is acting really wierd. When it is full it shows it, after about the first gallon of use, whenever I am moving forward the gas gauge goes WAY down, half a tank almost all the way to empty. It will only tell me the level if i am parked on a downhill incline, and will move up slightly when applying the brakes. i have never seen anything like this in my ten years on G2. Somebody please help.

Maybe your fuel sensor in the tank is fucked that’s why the gauge gives you weird readings?

Wow, ok, sure. Has anyone had any experience fixing this situation. I really would hate draining a tank at three dollars a gallon, and I know the sender fuel pump is under the back seat. Voodoo fuel gauge fix anyone?