My 2008 407 SVHDi has the dreaded engine light on and diagnosis by two reputable garages has so far been inconclusive. Yes there is a fuel problem but not clear whether its the fuel rail, control valve or diesel fuel pump? In any event to find out for sure means dismantling half the motor. I have sourced a remanufactured diesel pump overseas for A$750 + fitment another $700 but not keen until I get some certainty. Has anyone had experience , can recommend how to get to bottom of this? Appreciate input thanks.