Thanks for all the good advice. I wasn't about to get underneath. I've got an appointment at 8am at a shop. Normally I'd DIY but without all my tools and no jackstands or ramps, I'll have someone else do it.
Which screw is the bleeder screw?
I don't know how long it ran dry if it did. I added some more fluid last night and it started spraying out the hose so at least the pump is producing some pressure. The car did not rise up so I assume the leak is bad enough that it is not building enough pressure to push it up.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13