Those little 'O' rings also allow oil to drain back if they are worn/squashed, and after starting it can take a couple of seconds More to get full pressure as the pump first has to fill the filter up...

They seem to be seldom replaced by your average service-place...

I tend to change 'em every other filter change....

__________________
http://i190.photobucket.com/albums/z...0TDnoplate.jpg

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....