83 300CD no start after fuel filter change

Help!

I just completed a diesel purge on my 1983 CD, I changed both fuel filters. With the secondary fuel filter nut loose, I used the manual fuel pump to remove the air. I have a feeling the pump is not working.... After 15-20 pumps with the manual hand pimp, I tightened the secondary nut. At this stage the primary filter was 1/4 full. I ran the engine, it ran for about 30-40 seconds then died. The primary fuel pump is full. I repeated the air purge procedure again... no success. the engine will not start.

Can you please advise next steps... advanced thanks!

Graham

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