Filler neck assembly for fuel tank

A filler neck assembly comprising:

• a plastic fuel tank having a wall with an opening extending therethrough;
• a filler neck tube extending through said opening and having an annular stop flange projecting radially outward from said filler neck tube outside said wall and an annular lock flange projecting radially outward from said filler neck tube formed inside said wall to lock said filler neck tube to said fuel tank, said stop flange and said lock flange providing the sole means for securing said filler neck tube within said opening;
• a seal interposed in said opening between said wall and said filler neck tube;
• a washer disposed inside said fuel tank between said wall and said lock flange to engage said seal;
• wherein said seal is annular in shape and has an inner surface with an arcuate shape and an outer surface with a planar shape and flanges extending radially and overlapping said wall on an interior surface and an exterior surface of said wall;
• and
• wherein said washer has a recess extending therefrom to receive one of said flanges of said seal.

A filler neck assembly comprising:

• a plastic fuel tank having a wall with an opening extending therethrough;
• a filler neck tube extending through said opening and having an annular stop flange projecting radially outward from said filler neck tube outside said wall and an annular lock flange projecting radially outward from said filler neck tube formed inside said wall to lock said filler neck tube to said fuel tank, said stop flange and said lock flange providing the sole means for securing said filler neck tube within said opening;
• a seal interposed in said opening between said wall and said filler neck tube;
• a washer disposed inside said fuel tank between said wall and said lock flange to engage said seal;
• and
• wherein said washer has a flange extending therefrom to engage said seal to provide a spring force to said seal.

A filler neck assembly for a fuel tank comprising:

• a plastic fuel tank having a wall with an opening extending therethrough;
• a filler neck tube, being a monolithic structure, extending through said opening in said fuel tank and having an annular stop bead projecting radially outward from said filler neck tube outside the wall and a continuously formed, annular lock bead projecting radially outward from said filler neck tube formed inside said wall to lock said filler neck tube to said fuel tank, said stop bead and said lock bead providing the sole means for securing said filler neck tube within said opening;
• a seal interposed in said opening radially between said wall and said filler neck tube, said seal being annular in shape and having an inner surface with an arcuate shape and an outer surface with a planar shape;
• and
• a washer disposed inside said fuel tank axially between said wall and said lock flange to engage said seal, said washer having an aperture extending axially therethrough to allow said filler neck tube to extend through said washer.

A filler neck assembly comprising:

• a plastic fuel tank having a wall with an opening extending therethrough;
• a filler neck tube extending through said opening in said fuel tank and having an annular stop flange projecting radially outward from said filler neck tube outside said wall and an annular lock flange projecting radially outward from said filler neck tube formed inside said wall to lock said filler neck tube to said fuel tank, said stop flange and said lock flange providing the sole means for securing said filler neck tube within said opening;
• a seal interposed in said opening between said wall and said filler neck tube, said seal being annular in shape and having an inner surface with an arcuate shape and an outer surface with a planar shape;
• a washer disposed inside said fuel tank between said wall and said lock flange to engage said seal, said washer having an aperture extending axially therethrough to allow said filler neck tube to extend through said washer;
• wherein said seal has flanges extending radially and overlapping said wall on an interior surface and an exterior surface of said wall;
• and
• wherein said washer has a recess extending therefrom to receive one of said flanges of said seal.

A filler neck assembly comprising:

• a plastic fuel tank having a wall with an opening extending therethrough;
• a filler neck tube extending through said opening in said fuel tank and having an annular stop flange projecting radially outward from said filler neck tube outside said wall and an annular lock flange projecting radially outward from said filler neck tube formed inside said wall to lock said filler neck tube to said fuel tank, said stop flange and said lock flange providing the sole means for securing said filler neck tube within said opening;
• a seal interposed in said opening between said wall and said filler neck tube, said seal being annular in shape and having an inner surface with an arcuate shape and an outer surface with a planar shape;
• a washer disposed inside said fuel tank between said wall and said lock flange to engage said seal, said washer having an aperture extending axially therethrough to allow said filler neck tube to extend through said washer;
• and
• wherein said washer has a flange extending therefrom to engage said seal to provide a spring force to said seal.

A fuel tank assembly comprising:

• a plastic fuel tank having a wall with an opening extending therethrough;
• a tank filler neck tube extending through said opening in said fuel tank and having an annular stop flange projecting radially outward from said filler neck tube outside said wall and an annular lock flange projecting radially outward from said filler neck tube formed inside said wall to lock said filler neck to said fuel tank, said stop flange and said lock flange providing the sole means for securing said filler neck tube within said opening;
• a seal interposed in said opening radially between said wall and said filler neck tube, said seal being annular in shape and has an inner surface with an arcuate shape and an outer surface with a planar shape;
• and
• a washer disposed inside said fuel tank axially between said wall and said lock flange to engage said seal, said washer having an aperture extending axially therethrough to allow said filler neck tube to extend through said washer.