Fuel tank filler neck assembly

A fuel tank filler neck apparatus comprising

• a filler neck comprising a side wall and a filler neck low-permeation layer coupled to an interior surface of the side wall and configured to define a boundary of a fuel-conducting passageway extending through the filler neck, and
• a filler neck component comprising a base arranged to lie in the fuel-conducting passageway and a component low-permeation layer coupled to an exterior surface of the base, wherein the filler neck low-permeation layer is made of a first material, the component low-permeation layer is also made of the first material, and the component low-permeation layer is bonded to the filler neck low-permeation layer at a bond joint to retain the filler neck component in a fixed position in the fuel-conducting passageway to establish a low-emission union of the component and filler neck low-permeation layers to provide means for blocking permeation of liquid fuel and fuel vapor extant in the fuel-conducting passageway to atmosphere surrounding the side wall through the component and filler neck low-permeation layers
• wherein the filler neck component further comprises a closure cap configured to mate with and close an opening into the fuel-conducting passageway defined by the filler neck low-permeation layer, wherein the closure cap includes an annular seal arranged to mate with a portion of the component low-emission layer coupled to an exterior surface of the base and a cap body configured to carry the annular seal and engage the base to establish a sealed connection between the cap body, annular seal, and the component low-emission layer to block discharge of liquid fuel and fuel vapor from the fuel-conducting passageway through a space between the closure cap and the component low-emission layer, and wherein the base cooperates with the filler neck low-emission layer to define a leak-path conduit therebetween that originates and terminates in the fuel-conducting passageway so that any liquid fuel and fuel vapor that flows in the leak-path conduit is emptied into the fuel-conducting passageway and is unable to escape to the atmosphere surrounding the filler neck.

A fuel tank filler neck apparatus comprising

• a filler neck component formed to include a fuel-conducting conduit,
• an annular component low-permeation layer coupled to and arranged to surround an annular exterior surface of the filler neck component,
• an annular filler neck low-permeation layer arranged to surround the annular component low-permeation layer and bonded to the component low-permeation layer at a bond joint to establish a low-emission union of the component and filler neck low-permeation layers to provide means for blocking permeation of liquid fuel and fuel vapor extant in a fuel-conducting passageway formed in the annular component low-permeation layer to atmosphere surrounding the filler neck low-permeation layer, and
• an annular side wall coupled to and arranged to surround the annular filler neck low-permeation layer to form a filler neck containing the filler neck component.

A fuel tank filler neck apparatus comprising

• a filler neck component formed to include a fuel-conducting conduit,
• an annular component low-permeation layer coupled to and arranged to surround an annular exterior surface of the filler neck component,
• an annular filler neck low-permeation layer arranged to surround the annular component low-permeation layer and bonded to the component low-permeation layer at a bond joint to establish a low-emission union of the component and filler neck low-permeation layers to provide means for blocking permeation of liquid fuel and fuel vapor extant in a fuel-conducting passageway formed in the annular component low-permeation layer to atmosphere surrounding the filler neck low-permeation layer, and
• an annular side wall coupled to and arranged to surround the annular filler neck low-permeation layer to form a filler neck containing the filler neck component
• wherein the filler neck component further comprises a closure cap configured to mate with and close an opening into the fuel-conducting passageway defined by the filler neck low-permeation layer, wherein the closure cap includes an annular seal arranged to mate with a portion of the component low-emission layer coupled to an exterior surface of a base and a cap body configured to carry the annular seal and engage the base to establish a sealed connection between the cap body, annular seal, and the component low-emission layer to block discharge of liquid fuel and fuel vapor from the fuel-conducting passageway through a space between the closure cap and the component low-emission layer, and wherein the base cooperates with the filler neck low-emission layer to define a leak-path conduit therebetween that originates and terminates in the fuel-conducting passageway so that any liquid fuel and fuel vapor that flows in the leak-path conduit is emptied into the fuel-conducting passageway and is unable to escape to the atmosphere surrounding the filler neck.