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I had extra insulation all over my fuel pump that Toyota did. I ended up removing it all because it doesn't do anything in reducing the sound. All it did was probably increase the heat temperature inside. Been having better luck with the Lucas Upper Cylinder cleaner in my fuel tank. Several 95+ degree days and haven't heard loud chirping. Maybe a hint of it faintly, but more times than a few, I don't hear anything at all.
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