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What could be the source of a high-pitch whistle that comes with long trips? on 2006 Dodge Grand Caravan

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The whistle only starts after driving several hundred of miles at a time. Also, in extreme hot temperatures. Other (most) times, there is no whustle at all. This has been going on for two years. It is coming from the back of the vehicle. I assume it involves the fuel system, but I don't think it's the fuel pump.
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