In a previous vehicle I had the same issue. Shell gas caused it. Shell paid for the repairs, just had to show them receipts. Perhaps this or something like it has caused the failure. Save your receipts and search the web. I also suffered a 25% drop in gas mileage after the gauge failure.
http://www.sptimes.com/2004/05/29/Ta...ums_up_f.shtml
WATCH THAT GAUGE
Shell asks customers experiencing unusual gas gauge readings to monitor their mileage or to keep fuel tanks filled to avoid running out. Customers who think their vehicles' fuel gauges have been affected by gasoline originating from Motiva Terminals can contact Shell Customer Service Center at 1-866-562-6690 or file a claim online at
www.interactclaims.com/shell