On the 1999 Pontiac GrandAm, when the Fuel Gauge is not reading correctly, inaccurate or stuck on E/F, this is actually a very common GM vehicle problem. The fault here is going to lie in the Fuel Level Sensor. The Level Sensor is mounted to the side of the Fuel Pump Assembly, located inside the fuel tank. Carefully inspect the electrical connector and wire harness to the top of the fuel pump assembly, looking for any loose, broken or rubbed-through wires (inspect carefully, this is common!). If the visual inspection checks ok, replacing the Fuel Level Sensor should solve the problem.
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