I guess the issue would be either you run out of fuel or the diesel purge gets diluted in the tank and is not as effective as running it under the hood.

So it could work, but probably not as effective as running a tank under the hood.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD