Starting at 10,000 miles the fuel pump started making intermittent screeching noise that progressively got worse till it was constant on startup and running at 15,000 miles. Fuel pump screen appears to have been clogged with black material which may have been oxidized aluminum from the uncoated factory tank. Pump was replaced by dealer under warranty but chance of future failures remain. Failure of fuel pump could result in loss of vehicle control on the highway. Other than noise from the pump the only other indicator was a decrease in battery voltage noted over time. As the pump got worse battery voltage decreased.