Fastlane shows 4 different vacuum pump repair kits for the 77 300d. Does anyone know how to figure out which one I need. They all look quite different.

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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

Because you said you saw oil coming up the line when you connected the speedy to the shutoff valve, I am more inclined to think the diaphragm in the shutoff actuator is getting spongy. I replaced my actuator recently as the engine wasn't shutting down, and took the old actuator apart (curiosity), oil had come through the diaphragm to the top side. Yes, the oil is coming from inside the injector pump.
20" of vacuum is a little bit low, but still pretty good. I was indicating 22" and after I changed the actuator, all is fine.
Any oil that may have gotten into your line would eventually go back towards the pump, not necessarily toward the booster.

The shut off vacuum pod is cheep to replace as apposed to a rebuild job.
Just be carefull when installing.

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1984 300SD turbo 126
"My true love"

God made me an atheist and who am I to question His wisdom

Here is a safe way to replace the vacuum shut off pod.
Vacuum Shut off device & pics

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1984 300SD turbo 126
"My true love"

God made me an atheist and who am I to question His wisdom

Here is a safe way to replace the vacuum shut off pod.
Vacuum Shut off device & pics
May save you from a runaway.

__________________
1984 300SD turbo 126
"My true love"

God made me an atheist and who am I to question His wisdom

Thanks Gears, I actually performed this repair some time ago. I did in fact use the how-to to make sure I didn't create a runaway engine situation. All went well and it shuts down as it should!

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Cousin Dave
83' 300SD 250k+ and going strong!

Take the best that exists, make it better!
If it doesn't exist, create it!
Accept nothing nearly right or good enough!