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No, you should not be hearing the pump. I've had two other GM cars before my Olds. A that humming is usually an idication that you might be nneding to look at a replacement pump. Then again, it may never go despite the fact that it's making strange noises. Definatly check it out. But, don't take it to a dealer. In that case, you'd be buying the pump whether or not you needed it.
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