Feilhaber got Kansas City (8-5-6) off to a quick start in the 6th minute when he got to a loose ball in the box and fired a shot past Chicago goalkeeper Paolo Tornaghi.
Then just 2 minutes later, Zusi doubled the advantage when his crossing pass found its way into the upper corner of the net.
The result temporarily pulled Kansas City into a tie with Montreal atop the Eastern Conference standings with 30 points.
Mike Magee tallied in the 38th minute for the Fire (6-8-3).
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