I have the SAME problem! Been driving me crazy for awhile now. I've replaced all three of the washer pumps and seals and it still does it. It'll go along fine for awhile, then all of a sudden the warning light comes on and the tank is empty. I have an upcoming warranty trip to the dealer and it's on the hit list.

Last time I was in there, the service writer mentioned that the check valves can go bad the fluid can siphon out of the nozzles. That might make sense as ONE TIME I did see some excess fluid underneath the nozzles under the cowl. Hopefully someone with prior experience will chime in.

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David

2005 4.4i Sport