The fuel sender unit needs to be replaced. Expensive at the dealer, but cheap for the DIY'er. Assuming you are a DIY'er since you posed the question here, you can get the details by searching Youtube for fuel sender replacement. There are a number of people who have videos with the details. You basically have to pull your spare tire and carpeting from your trunk, and be limber enough to climb in the trunk and remove the combo fuel pump / sender from your fuel tank and swap out the sender unit. I'll attach a link of someone else's Youtube video who has the details, including the part number you need from GM. Less than $50 ?
Source: http://www.youtube.com/watch?v=-7cY_IPCV...
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