For the spin on fuel filter for my 300SDL, the bolt passing through
the upper housing has a hole sideways in it. Does this hole need to
line up with the hole in the housing or is it not important? Also, the
two O-rings...I know the larger ring goes at the top end of the bolt
to seal from the top, but am i correct in thinking the smaller one
goes down to the bottom of the hole in the housing plate? When i took
the old one out there was only the top ring on so i am guessing about
the smaller based on reading in a diesel forum that the smaller one
seperates the filtered from non-filter fuel..or something like that.
On-line parts diagrams just show both on the bolt but not if the
smaller one goes to the bottom of the "well".
TIA
Shannon