[Corbettdrew]

Having some issues on my new backdraft iconic 427. The fuel gauge does not consistently show the correct fuel. Sometimes it shows no fuel, couple of minutes later half a tank. It does not seem like it is just the swoosh of fuel, its pretty consistent with showing a quarter or half a tank as I drive. When I refuel, it shows empty until I drive about five minutes. Then it never shows full. It will show almost full then drop down to half full after 20 or so miles. Its definitely not showing what is actually in there consistently. Its an autometer (spelling ?) gauge. My mechanic told me I need to take the fuel tank out to replace the sensor. Any others experience this? Thoughts?