Replace the primer pump. They're cheap on ebay. Get all or 98% of the air out of the system. Change the air filter. Lubricate all linkages. Replace the glowplugs as you don't know how many miles are actually on the engine. Also dump in some algaeside. Once you get it running, run a can of diesel purge through it and if you can, adjust your valves.

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1987 VW Jetta Mk II - Daily Driver
1992 W201 2.3 - sold
1985 W126 380se - sold
1985 W123 OM617.952 - sold
1981 W123 OM617.912 - sold
1986 W201 2.3 - sold
1979 W123 OM 617.912 - sold