Patent ID: 8056589

Claim:
An overfill prevention device for preventing overflow of a fluid storage container which is fillable via a fill nozzle having a fill-limiting sensor proximate to an outlet one end thereof, the fluid storage container having a container body with a fill opening formed therethrough, and the container body having a predetermined full level, the overfill prevention device comprising: a filler cup member configured to receive the nozzle, the filler cup member having opposing upper and lower cup regions, the upper cup region adapted to fit within the fill opening of the container body and sealingly integrate thereto, and the lower cup region disposed inside the container body; a seal member operatively attached to the filler cup member intermediate the upper and lower cup regions and adapted for receiving and sealing to the nozzle; and a breather piece integrated with the filler cup member, the breather piece defining a vapor path with first and second openings, wherein the second opening is located below the predetermined full level, and the first opening is fluidly coupled to the lower cup region vertically lower than the second opening relative to the container body.