The original Chevy pump motor has a good life. Running the vehicle out of fuel, which will actually run the pump in a dry state can shorten the expected life span considerably. Gasoline is a petroleum product and actually lubricates the inside of the fuel pump. The more you run the vehicle low on fuel or out of fuel, the more damage will occur and the quicker the pump will fail. Try replacing the pump and follow the above procedures for a good performance of the pumps. Cavalier fuel pumps available here
http://www.carpartswarehouse.com/carparts/1998/Chevrolet/Cavalier/Fuel_Pump_Assembly.html
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