As long as it was still pumping oil out, there should be little or no damage. Sticking a rag into the air filter intake or putting a plastic bag over the air filter intake should have stopped it as well as cutting the fuel line or clamping a vice grip down on the fuel line.

__________________
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