Bill Hogarty and Tom Byrnes....thanks for your input.  I had looked at
the B-4F-60 filter that Lancair sells.  It is a centered metal filter
which is probably more suitable to use on the high pressure side.  Two
of the reasons I was considering using a fuel filter on the return side
were (1) 10 micron filtering and (2) a relief spring.  My concern is
this:  Will the filter media stand up to the hydraulic oil? I don't want
to create a bigger problem than the one I'm trying to fix.
Craig Berland