New style primer pump. Hot, cold doesn't seem to matter. What's odd is that I can flip the key off and immetiately back on it starts without a glow plug cycle. I might try to replace the vacuum shut-off valve on the ignition lock and see if it is sticking.

-Tad

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1995 G320
2003 C230 Kompressor Coupe
2005 ML500
2007 ML350