Quote:
Originally Posted by DefMunkie
So the chirping sound is generated from the fuel pump itself?
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Yep. They keep issuing new revisions of the pump. It keeps chirping. Maybe the latest iteration has fixed it. I don't know.
At one point Toyota was experimenting with putting insulation all around it so you couldn't hear it. A member here on this board was one of the test cases and had the foam installed at the dealer. It actually chirped louder. Apparently the insulation was holding heat in and making the sound worse.
Other manufacturers have solved the problem with sound deadening insulation, but they designed it that way from the beginning.