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What could be the source of a high-pitch whistle that comes with long trips?

(2006 Dodge Grand Caravan)
in Decatur, IL on April 29, 2013
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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Popular Answer
of Greg's Orange Auto on April 29, 2013
very poss the fuel pump itself. have it diag and get est,hard to help without hearing the noise
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