One problem related to tank filler pipe and cap has been reported for the 2006 Toyota Tundra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota Tundra based on all problems reported for the 2006 Tundra.
When fueling the vehicle, the filler nozzle will eject from the vehicle when the nozzle shuts the fuel off upon filling the tank. I have had one instance of the filler spout ejecting before the tank filled.