I would take the lines off @ the injectors and make sure you are getting fuel to all 4 injectors. If you are, then the above method should get it started..
DO NOT use ether. As tempting as it may be, it will cause damage.

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project