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Message: <blockquote data-quote="ORVietVet" data-source="post: 21560" data-attributes="member: 9438">Welcome to the forum from Oregon.Ground problems are notorious on lots of GM trucks. Look thru Charm.li and check where the grounds are on your truck and literally open up every one of them and clean/inspect. If need to redrill and tap and reattach, do so. The fuel gauge may be ground related but could also be sensor related. Found this at Charm.li: <a href="https://charm.li/Chevrolet/2009/Silverado%203500%204WD%20V8-6.0L/Repair%20and%20Diagnosis/Powertrain%20Management/Fuel%20Delivery%20and%20Air%20Induction/Fuel/Technical%20Service%20Bulletins/Fuel%20System%20-%20GM%20Fuel%20System%20Treatment%20PLUS%28R%29%20Info./" target="_blank">https://charm.li/Chevrolet/2009/Silverado 3500 4WD V8-6.0L/Repair and Diagnosis/Powertrain Management/Fuel Delivery and Air Induction/Fuel/Technical Service Bulletins/Fuel System - GM Fuel System Treatment PLUS(R) Info./</a>Basically TSB#05-00-89-078C talks about the fuel pump sender unit gets sulfur buildup that causes readings problems and using an additive like Techron for a few tanks may clean the sensor up and get the fuel gauge to work again. Is way easier than replacing the pump sensor assembly. I am dealing with this on a customer's 09 Silverado K2500HD, right now.</blockquote>