2008 Volkswagen Jetta Q&A

2008 Volkswagen Jetta Question: High pitched whisle from underneath right rear seat

Purchased a used 2008 Jetta SEL the other day and I noticed a high pitched whisle or whine coming from underneath the right rear seat. The noise changes in pitch when the throttle is pressed. It looks to me like it's coming from the fuel line but I can't be sure. Please help. -
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