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Check all fuses. The gauge sending unit/pump have known issues. Cracking, leaks and failure. It sits on the top of the tank so it is a PITA to get to. I find that it would be strange to not get any codes? Instrument cluster failures are more uncommon these days but have been known to happen. The individual gauge unit may have had a failure. The tiny drive units can be replaced in these gauges if you do some research and can find a supplier. You have to be somewhat mechanicaly inclined and dealers will not do it. It is possible to find a replacement cluste if this is the issue and you want to do a swap out but it will have to be recalibrated.

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Q: On a 05 Chevy trailblazer What cause the fuel gauge to read empty when it is full?
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