Fuel Guage Stops at about 1/3 tank...

With the chevy suburban (and perhaps some other GM vehicles), if the fuel gauge gets stuck at 1/3 tank, or if it's at that level and begins to act like it's out of gas (because it actually is), then you need to drop the fuel tank. Inside the tank is a square shaped box like area that the fuel sender and pump sit in. It is held to the bottom by three screws/pegs that should be held on by three washers that snap onto them. If you look into the tank and see that the square box area is loose and freely moving inside the tank, then you'll need to locate the washers inside, reposition the box onto the three screws/pegs, and snap the washers back on. Get a new gasket and put the pump back. You should find that the problem has corrected itself. That will save you the expense of buying a new fuel sender which is well over $100 on the after market.