Hi, guys.
I've "lurked" all the posts about this issue, as I usually find an answer without posting any questions. No such luck this time around. The door locks, trunk and fuel cap are locked on my 1982 300SD. I replaced fuse 13, which had blown, no dice. Pulled the battery (to reset vacuum pump), no dice. The vacuum pump in the trunk does not run, and door locks don't unlock when you turn the key. I pulled the back seat, looking for the "magic cable", which I apparently don't have. I also looked at the vacuum lines, hoping there was a tee I could disconnect and suck on, no dice. I have tried the (master) key in every possible possible position in the trunk keylock, no go. I am aware of the thread where the guy tells how to drill the lock, but I'm not hot on trying that. Finally, in desperation, I contacted a fellow who bills himself as a "mobile mechanic" specializing in Mercedes. I don't have great hopes, as I spoke with the man and he insisted that in 30 years of working on Mercedes he had never seen an older diesel with a vacuum pump in the trunk (like mine). The car is out of gas and I can't get the fuel cap open, so it will sit where it is and I'll let him have a go at it. In the meantime, if anybody has any suggestions I haven't seen, I'd appreciate the input.