I wouldn't be too worried about your pump. I bought my 300TD a year ago with no fluid in the SLS resevoir. I had no previous experience with mercedes diesels. The car had no owners manual and it took awhile for me to find this site so I had no idea the SLS even existed. My pump ran for several months, maybe 5,000 miles, and who knows how long before that with no fluid. I filled it up and it works fine except for a small leak in the same line you're talking about.
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1982 300TD 279K.
1984 190D 5sp 265K
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