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Correct, they are completely replacing the fuel pump and related lines as shown in the TSB pics. My guess is that the sound is coming back because there may be nothing to KEEP the plunger stopper thingy oriented the way it should be to avoid the chirping. Either that, or Scion/Toyota is just replacing the part and nothing is being done about the orientation of the internals.
Don't worry, I'm sure Toyota will just recall all the cars at some point...don't they do that every few years just for kicks?
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