<p>A fuel tank (100) has a primary sump (114) and a secondary sump (116). A first vent valve (130) and a second vent valve (132) are disposed within the fuel tank (100). The first vent valve (130) is closed when a level of fuel in the primary sump (114) is equal to or higher than a first predetermined filling level (B2), and the second vent valve (132) is closed when a level of fuel in the secondary sump (116) is equal to or higher than a second predetermined filling level (A2) in a refueling procedure.
</p>
