Yep...I'm betting that the oring is not seated in the correct groove.
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First Bimmer..."Miss December"...2000 323i, purchased Dec. 2013 w/82K on the clock. PM thus far...pads/rotors, belts/pulleys, complete CS overhaul, FCABs, plugs, autotranny/differential service, fuel pump, filter, and relay. Full front end refresh with LCAs and bushings, struts and mounts, inner/outer tie rods, sway bar endlinks and bushings.