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Q: 2006 2500HD fuel gauge reads low when there's 10gal of fuel left in tank? on 2006 Chevrolet Silverado 2500 HD

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Can tank be dropped and sending unit be cleaned or is it in need of total replacement?
(1) Answer
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Theres a lot of problems with these clusters. You may need to have the cluster repaired. Otherwise do so digging first and check your resistance at sening unit wiring before thinking about dropping tank.