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Message: <blockquote data-quote="ORVietVet" data-source="post: 21510" data-attributes="member: 9438">Well, I went to Charm.li to look at the labor times for dropping the fuel tank on the 2009 Silverado K2500HD. I then found a TSB #05-00-89-078C that effected GM vehicles 2013 and older, about fuel sender problems caused by corrosion from sulfur contaminates in fuel. It states that senders were effected by that giving erratic fuel gauge readings. Supposed to use a GM fuel treatment that is added to the fuel tank. Basically 1 ounce for every gallon size fuel tank.I informed my customer and she is going to add the additive as instructed and monitor the gauge and when she brings the truck to me for oil change and steering/suspension inspection, I will do a bi-directional test on her gauge.More results pending and will report here. Her fuel gauge erratic readings had just started within the last month.I forgot to say, that according to the TSB, the additive will clean the sender and allow it to work properly.</blockquote>