end walls 29 and 31 walls 27 28 29 and 31 form a generally rectangular passage 32 through housing 26 as shown in fig4 and 5 side walls 27 and 28 have outwardly directed bottom flanges 27a and 28a respectively suitable fastening means 33 as bolts shown in fig3 are used to secure the side walls to manifold 25 referring to fig4 nebulizer 13 has a body 34 located in the central portion of passage 32 body 32 has an internal chamber 36 and a neck 37 attached to the side wall 28 a passage 38 extended through neck 37 is in communication with the fuel line 17 nuts 39 and 41 threaded on neck 37 secure body 34 to side wall 28 the lower end of body 34 has an annular flange 42 having a recess accommodating a toroidal washer 43 washer 43 has a thin annular neck or collar 44 to minimize the transfer of the vibrations of the center portion of the washer 43 to body 34 a generally cup shaped cover or cap 46 is threaded onto body 34 to clamp the washer 43 to body 34 cover 46 has a bottom with a central opening 47 allowing the fuel particles to be dispensed into passage 32 located within cover 46 is a head or cup member 48 having a longitudinal chamber 49 the upper end of chamber 49 is in communication with chamber 36 member 48 is located.