ac93ca6a_goya_Shi___Patent_applications__Description
[Patent application number] 20090025805 [Published] 01-29-2009 [Description] 
FUEL TANK SYSTEMS - A fuel tank system includes a fuel tank that has a tank wall defining a fuel storage space. A heat control chamber is formed within the tank wall. A pressure control device can control a pressure within the heat control chamber in response to a difference between a temperature within the fuel storage space and a temperature externally of the tank wall.
Yamada, Nagoya-Shi - Patent applications