This condition may be the result of the corrosive effect on the contact surfaces of the fuel tank sender, causing erratic fuel gauge readings. Typically the gas tank needs to be removed and the sending unit attached to the fuel pump needs replacement. You may need to call your dealership and check if there is a bulletin published with this problem from the manufacturer first.
It sounds like you may have a problem with the float inside your gas tank that measures the level of gasoline inside the tank. In order to repair or replace this part, your fuel tank would need to be emptied and then taken down. It*s probably best to have a professional look at the vehicle so that they can correctly diagnose the problem and take the correct steps to fix it.
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〉 Answered on Mar 10th, 2009 by Suzanne Grego, Technician at City of Philadelphia Fleet Management