referring to fig1 through 5 , a first fuel rail assembly 100 includes a non - round fuel conduit 110 that axially extends along an axis 102 from a first end 112 to a sealed second end 114 . conduit 110 may include a top wall 116 , two sidewalls 118 and 122 , and a bottom wall 124 as illustrated . other configurations of the conduit may be possible . for example , conduit 110 may be tubular or may be created by stampings of various shapes that are brazed together . conduit 110 has an exterior surface 126 and an interior surface 128 ( shown in fig4 ). a fuel inlet 130 is shown to fluidly connect first end 112 of conduit 110 with a fuel supply system ( not shown ). fuel inlet 130 does not need to be positioned at first end 112 but may be positioned anywhere along conduit 110 . a plurality of fuel injector sockets 140 is connected to bottom wall 124 of conduit 110 . injector sockets 140 are axially spaced apart along bottom wall 124 . axially extending stiffening features in form of structural components 150 are added to fuel conduit 110 . structural components 150 may be formed separately from conduit 110 and may be attached to either the exterior surface 126 ( as shown in fig1 - 4 ) or the interior surface 128 ( as shown in fig5 ) such that structural components provide a resistance to flexing to conduit 110 and , thus , enable reduction of the noise radiated by fuel rail assembly 100 . structural components 150 may be attached to conduit 110 , for example , by brazing or welding . structural components 150 may be formed from the same material as conduit 110 or from a different material . structural components 150 may be positioned on either wall , such as top wall 116 , sidewalls 118 and 122 , or bottom wall 124 as shown in fig3 . on top wall 116 and sidewalls 118 and 122 , structural components 150 may be attached as continuous features that continuously extend along axis 102 over the entire length of conduit 110 as shown in fig1 or may be attached intermittently as segments as shown in fig2 . on bottom wall 124 , structural components 150 may be attached as segments between fuel injector sockets 140 as shown in fig3 . the dimensions , such as width 152 , height 156 , and length 154 , may be varied to adjust the noise reduction effect . while structural components 150 are shown in fig5 as attached to top wall 116 , both sidewalls 118 and 122 , bottom wall 124 , it may not be necessary to apply structural components 150 to each of those walls to achieve the desired stiffening effect for reducing the noise radiated by fuel rail assembly 100 . structural components 150 may be applied to only one of the walls 116 , 118 , 122 , or 124 of conduit 110 , to all walls , or to any number in between . continuously extending structural components 150 as shown in fig1 may be combined with intermittently extending structural components 150 as shown in fig2 . segments of structural components 150 as shown in fig2 may be positioned on adjacent walls , such as top wall 116 and sidewall 118 or top wall 116 and sidewall 122 , such that segments of structural components 150 are arranged alternating . while structural components 150 are shown either attached only to the exterior surface 126 of conduit 110 ( as shown in fig1 - 4 ) or attached only to the interior surface 128 of conduit 110 ( as shown in fig5 ) combinations thereof are possible . while the continuously extending structural components 150 are shown in fig1 to form a generally straight line , it may be possible for the structural components 150 to axially extend in a non - straight line , such as a curved line . while the structural components 150 are shown in fig1 - 5 as being positioned centered on the walls , an off - centered position may be applicable . only one structural component 150 applied to a single wall , such a top wall 116 , sidewalls 118 and 122 , and bottom wall 124 , is shown in fig1 - 5 , but it may be possible to apply two or more structural components 150 extending axially in parallel to each of these walls . referring now to fig6 through 8 , a second fuel rail assembly 200 includes a non - round fuel conduit 210 that axially extends along an axis 202 from a first end 212 to a sealed second end 214 . conduit 210 includes a top wall 216 , two sidewalls 218 and 222 , and a bottom wall 224 . a fuel inlet 230 fluidly connects conduit 210 with a fuel supply system ( not shown ). fuel inlet 230 is not limited to be positioned at first end 212 as shown in fig6 and 7 . a plurality of fuel injector sockets 240 is connected to bottom wall 224 of conduit 210 . injector sockets 240 are axially spaced apart along bottom wall 224 . axially extending stiffening features in form of indentations 250 are integrated into fuel conduit 210 . indentations 250 may be , for example , formed as depressed slots or crimp dents . indentations 250 provide an increased resistance to flexing to conduit 210 and , thus , enable reduction of the noise radiated by second fuel rail assembly 200 . indentations 250 may be integrated into either wall , top wall 216 , sidewalls 218 and 222 , or bottom wall 224 . on top wall 216 and sidewalls 218 and 222 , indentations 250 may be formed as continuous features that continuously extend along axis 202 over the entire length of conduit 210 as shown in fig6 or may be formed intermittently as segments as shown in fig7 . in bottom wall 224 , indentations 250 may be formed as segments between fuel injector sockets 240 . the dimensions , such as width 252 , depth 256 , and length 254 , of indentations 250 may be varied to adjust the noise reduction effect . while indentations 250 are shown in fig8 as formed in top wall 216 , both sidewalls 218 and 222 , and bottom wall 224 , it may not be necessary to form indentations 250 in each of those walls to achieve the desired stiffening effect for reducing the noise radiated by fuel rail assembly 200 . to achieve the desired stiffening effect to reduce the radiated noise , at least one indentation 250 is applied to at least one wall , such as top wall 216 , sidewalls 218 and 222 , or bottom wall 224 . continuously extending indentations 250 as shown in fig6 may be combined with intermittently extending indentations 250 as shown in fig7 . segments of indentations 250 as shown in fig7 may be positioned in adjacent walls , such as top wall 216 and sidewall 218 or top wall 216 and sidewall 222 , such that segments of indentations 250 are arranged alternating . while the continuously extending indentations 250 are shown in fig6 to form a generally straight line , it may be possible for indentations 250 to axially extend in a non - straight line , such as a curved line . while the indentations 250 are shown in fig6 - 8 as being positioned centered on the walls , an off - centered position may be applicable . only one indentation 250 formed in a single wall , such a top wall 216 , sidewalls 218 and 222 , and bottom wall 224 , is shown in fig6 , but it may be possible to form two or more indentation 250 that axially extend in parallel in each of these walls . referring now to fig9 through 11 , a third fuel rail assembly 300 includes a non - round fuel conduit 310 that axially extends along an axis 302 from a first end 312 to a sealed second end 314 . conduit 310 includes a top wall 316 , two sidewalls 318 and 322 , and a bottom wall 324 . a fuel inlet 330 fluidly connects conduit 310 with a fuel supply system ( not shown ). fuel inlet 330 is not limited to be positioned at first end 312 as shown in fig9 and 10 . a plurality of fuel injector sockets 340 is connected to bottom wall 324 of conduit 310 . injector sockets 340 are axially spaced apart along bottom wall 324 . axially extending stiffening features in form of protrusions 350 are integrated into fuel conduit 310 . protrusions 350 may be , for example , formed as protruded slots . protrusions 350 provide an increased resistance to flexing to conduit 310 and , thus , enable reduction of the noise radiated by second fuel rail assembly 300 . protrusions 350 may be integrated into either wall , top wall 316 , sidewalls 318 and 322 , or bottom wall 324 . on top wall 316 and sidewalls 318 and 322 , protrusions 350 may be formed as continuous features that continuously extend along axis 302 over the entire length of conduit 310 as shown in fig9 or may be formed intermittently as segments as shown in fig1 . in bottom wall 324 , protrusions 350 may be formed as segments between fuel injector sockets 340 . the dimensions , such as width 352 , height 356 , and length 354 , of protrusions 350 may be varied to adjust the noise reduction effect . while protrusions 350 are shown in fig1 as formed in top wall 316 , both sidewalls 318 and 322 , and bottom wall 324 , it may not be necessary to form protrusions 350 in each of those walls to achieve the desired stiffening effect for reducing the noise radiated by fuel rail assembly 300 . to achieve the desired stiffening effect to reduce the radiated noise , at least one protrusion 350 is applied to at least one wall , such as top wall 316 , sidewalls 318 and 322 , or bottom wall 324 . continuously extending protrusions 350 as shown in fig9 may be combined with intermittently extending protrusions 350 as shown in fig1 . segments of protrusions 350 as shown in fig1 may be positioned in adjacent walls , such as top wall 316 and sidewall 318 or top wall 316 and sidewall 322 , such that segments of protrusions 350 are arranged alternating . while the continuously extending protrusions 350 are shown in fig9 to form a generally straight line , it may be possible for protrusions 350 to axially extend in a non - straight line , such as a curved line . while the protrusions 350 are shown in fig9 - 11 as being positioned centered on the walls , an off - centered position may be applicable . only one protrusions 350 formed in a single wall , such a top wall 316 , sidewalls 318 and 322 , and bottom wall 324 , is shown in fig9 , but it may be possible to form two or more protrusions 350 that axially extend in parallel in each of these walls . by aligning a variety of stiffening features , such as added structural components 150 , indentations 250 , or protrusions 350 , axially relative to a fuel conduit , such as fuel conduit 110 , 210 , or 310 , each wall where a stiffening feature is integrated is divided into panels . each of such panels has a reduced radiating surface area , which results in a reduction of objectionable frequency noise . while in fig1 - 11 either added structural components 150 , indentations 250 , or protrusions 350 are shown , respectively , it may be possible to combine added structural components 150 , indentations 250 , and / or protrusions 350 in a single fuel conduit , such as conduit 110 , 210 , or 310 . while only added structural components 150 , indentations 250 , or protrusions 350 are shown as axially extending stiffening features , other forms of axially extending structures may be used as stiffening features . while the invention has been described by reference to various specific embodiments , it should be understood that numerous changes may be made within the spirit and scope of the inventive concepts described . accordingly , it is intended that the invention not be limited to the described embodiments , but will have full scope defined by the language of the following claims .