Is there a remaining stump? I've sold the problem in the past by drilling 1" holes in a stump and filling the holes with stump killer which is available at the hardware store. My neighbor solved the problem by drilling holes into the stump and repeatedly filling them with kerosene or diesel. After the stump soaked it up, he set it on fie and it slowly smouldered away into ash.

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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