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Will a fuel pump off of a chevy trailblazer 2006 fit on a 2002 trailblazer???

are the part numbers the same?

No for at least two reasons. One, the 2002 uses an external to tank fuel filter while the 2006 uses a fuel filter that is incorporated into the fuel pump assembly. Two, the 2002 uses an external fuel pressure regulator while the 2006 uses one that is incorporated into the fuel pump assembly.