I have some additional thoughts. My starter seems to be drawing a lot of power. Too much power since it's drawing down the dual batteries very quickly when it fails to start. The batteries were new last week and I'm not getting 30 seconds of cranking out of them before the engine is slowing waaay down. I've load checked the batteries and they test fine. I'm wondering if it's drawing enough power to reduce the voltage at the fuel shut off solenoid enough so that it's not activating.

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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