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I think you may mean the fuel pressure sending unit. Thsi is only used on the early trailblazer/envoy/bravada platform. It is located at the end of a vacuum tube that leaves the air intake tube and terminates at the fuel pressure regulator/sensor near the top of the motor on the right side (while facing) just behind the top of the timing chain cover.

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16y ago
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Q: Where is the Fuel sensor location for 2002 Chevrolet 4.2 motor?
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