Totally respect all the input, here is what I did over the weekend , removed both pumps blew into bottom 'nipple' and could hear air coming out of the little square opening on one of the pumps...so aluminium taped it up, put back in and leak from that pump gone, but there was fluid under the second pump, removed that too and installed heatshrink on the lower shaft that sits in the rubber grommet/filter.....now so far so good no leaks (ps ordered the pumps anyway)

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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N