My 1987 300d turbo will not start. The engine turns over and wants to start, but does not. I changed the primary and secondary fuel filters and fule is being pump to the motor.
Does anyone have any ideas what the problem is?

Did the fail to start condition exist before you changed the filters ?

Have you checked out the glow plugs?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

If you just changed the filters, did you fill the big filter with fuel before installing? It takes a lot of cranking to fill the big filter. Then you have to bleed the delivery side of the injection system.

The FSM says to crank for a minute at a time with the pedal to floor, resting for a few mintues between cranks to cool the starter. Keep the pedal to the floor and the starter engaged when it catches until the engine runs on its own. I like to be kinder to my battery and starter so I disconnect the glow plug relay, crack all the injector lines and crank for 15 seconds at a time. When fuel drips from an injector line I tighten it and continue until I've tightened all the lines. Reconnect the glow plug relay and it should start easily.

Sixto
93 300SD 3.0