A heater for a canister includes a heater case embedded within an adsorption material and sealed at a top, and a heater core having a heat generation element and installed in the heater case. The bottom of the heater case is fitted into a heater retaining hole of a cap member in a hermetically-sealed state, for enabling the heat generation element and terminals of the heater core to be completely separated from the gas atmosphere containing the adsorbed fuel components within an activated carbon region. A leaf spring having a heat conductivity is arranged between an outside surface of one of a pair of strip-shaped ceramic plates constructing part of the heater core and an inner wall surface of the heater case, for retaining the heater core in place within the heater case and for permitting heat transfer from the heat generation element to the adsorption material.

An auxiliary fuel tank for a flexible fuel vehicle is provided. The auxiliary fuel tank is mounted to an auxiliary tank body for storing gasoline fuel and is installed in an engine compartment of a flexible fuel vehicle. The auxiliary fuel tank includes a canister that is coupled to the auxiliary tank body and has activated carbon therein. The canister is configured to collect fuel evaporation gas generated in the auxiliary tank body to supply fuel components to an engine.

A fuel system comprises a fuel tank including at least a top wall, a bottom wall, and one or more stanchions positioned within the fuel tank, each stanchion coupled to the top wall and the bottom wall. A strain gauge is positioned on the outside of the fuel tank, opposite an intersection of a stanchion and the top wall, such that degradation of the stanchion results in results in pressure-dependent deformation of the fuel tank that is registered by the strain gauge. In this way, degradation of deformable fuel tanks, such as polymeric fuel tanks, may be diagnosed and indicated.