What made you think it was the FD? That is an expensive part to replace without a firm diagnosis.

What parts have you tested? Spark?

I would look closely at the fuel system, especially the fuel pump relay. In a '92 it should have the MAS setup. Swap it for a known to be good unit. I have seen one that looked fine but was no good. Swapped it and the car fired up.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E