1985 Toyota Landcruiser 2h diesel cuts out and restarts aft

Hi guys, hope you can help me. My Landcruiser 2h diesel performs well until you turn a tight left at speed and a few moments up the road the engine momentarily cuts out and then refires and runs as normal with black smoke out the tail pipe for a moment. My hunch tells me that it is something to do with the deisel level changing somewhere by centrifugal force and possibly a water in diesel issue. Injectors are fine as performance is great other than left handers. Same effect with full or empty tank over many different tanks from different gas stations. I have already changed the fuel filter and with no joy. I would really appreciate a hand guys. Thanking you in advance. Jason.