Flexible conduit for use in fresh air intake and gas vapor outlet incorporated into a vehicle fuel tank to eliminate whistling within the conduit

A tubing incorporated into a vehicle fuel tank system, comprising:

• an elongated and flexible tubular shaped body having an enclosing wall defining a hollow interior and exhibiting, in cross sectional cutaway, pluralities of alternating inner and outer diameter spaced locations, said inner diameter locations associated with said body being provided in a range of between 4 mm to 50 mm;
• said inner diameter locations including a first plurality of outwardly protruding and annularly extending ribs, said first plurality of ribs each further having a substantially “V” profile;
• said outer diameter locations exhibiting a second plurality of ribs annularly projecting outwardly beyond said first ribs, each of said second plurality of ribs including a pair of substantially radially outwardly extending and spaced apart sidewalls terminating in an inwardly concave end surface, said sidewalls and concave end surface defining an annular pocket projecting outwardly from said wall, said second plurality of ribs each further exhibiting greater linear and radial dimensions than said first plurality of ribs;
• and
• said alternating arrangement of first and second pluralities of ribs interacting with an inner airflow profile established within said body to retard the generation of sound associated with the airflow.

A tubing incorporated into a vehicle fuel tank system, comprising:

• a plurality of individual tubing sections incorporated into each of gas vapor outflow and fresh air intake inflow lines;
• each of said tubing sections having an elongated and flexible tubular shaped body having an enclosing wall defining a hollow interior, was wall exhibiting, in cross sectional cutaway, pluralities of alternating inner and outer diameter spaced locations;
• said inner diameter locations including a first plurality of outwardly protruding and annularly extending ribs, said first plurality of ribs each further having a substantially “V” profile;
• said outer diameter locations exhibiting a second plurality of ribs annularly projecting outwardly beyond said first ribs, each of said second plurality of ribs including a pair of substantially radially outwardly extending and spaced apart sidewalls terminating in an inwardly concave end surface, said sidewalls and concave end surface defining an annular pocket projecting outwardly from said wall, said second plurality of ribs each further exhibiting greater linear and radial dimensions than said first plurality of ribs;
• and
• said alternating arrangement of first and second pluralities of ribs interacting with an inner airflow profile established within said body to retard the generation of sound associated with volumetric airflow within the tubular shaped body.