The set up on my 126 made it difficult to get much leverage with the channel locks. I sacrificed a cheap wood chisel. I tapped the chisel into the top surface of the nut on one side and then hammered it so as to make the nut turn.

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Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/

1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing

1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake.

Both on single tank WVO blend