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The sending units on these vehicle has been a continual problem. Mostly if your vehicle has a history of being in a corrosive environment. Corrosion eats away at the unit as it sits on the top of the tank. It is attached to the the fuel pump and is a big job to replace unless you have access to a lift.

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Q: What could cause the gas gauge on an 2003 Chevy Trailblazer to malfunction needle is not between empty or full after filling up?
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