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If the guage is acurate in the top half of the tank I would assume that the sensor mechanism is ok and that you have an electrical fault. I am not familiar with 97 buicks so perhaps look for a better answer. The lower half of many fuel gauges is problematic so do not be too concerned.

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17y ago
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Q: Why does the fuel gauge needle oscillate wildly when the gas tank is under half full on 1997 Buick park avenue ultra?
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