Starting and then stalling problem could be due to plugged or dirty fuel filters, including the one in the tank.
I have had good luck with WD-40 on lock problems, even helps keep them from freezing in cold weather. Some have suggested that it is not a good product choice for this application, and have preferred to use graphite powder.
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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150
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