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Some (in-tank) fuel pumps can be noisey on an empty tank w/ out a full tank of fuel to absorb the noise. A sudden change in sound might indicate a fuel pump on it's way out. Throw a some marvel's mystery oil or the likes in the tank to see if the added lubricity helps out.
G/luck
Joel
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2016 Subaru Forester 2.5i base CVT
2016 Nissan Quest SV
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