common rail 16 has a relatively flat metal body 150 body 150 has a central chamber 152b and side chambers 152a and 152c body 150 has a rectangular cross section bounded by end walls 154 and 156 and side walls 158 and 160 end walls 154 and 156 have a pair of inlet fittings 162 and 164 inlet fitting 162 is connected to conduit 80 for receiving fuel from solenoid valve assembly 14a into the common rail central chamber 152b fitting 164 is adapted to receive fuel from the solenoid valve assembly 14b through conduit 132 into the central chamber 152b side wall 158 has fuel discharge fittings 166a through 166f the opposite side wall 160 has fuel discharge fittings 168a through 168f the side chambers 152a and 152c communicate with central chamber 152b through cross drilled holes 165a through 165f the cross drilled holes 165a through 165f create a constant pressure and a perfect pressure distribution in the side chambers and eliminate the pressure fluctuations which occur in the central passage because of the pumping strokes and reflected pressure waves the number of fuel discharge fittings 165 166 168 or the number of cross drilled holes can vary depending on the engine application for example for a six cylinder engine the common rail 16 will have only twelve discharge fittings and six cross drilled holes for an arrangement like that illustrated in fig6 a or.