I have this same issue with my SD when I am at the end of the tank and take a long corner. It's just from the fuel sloshing in the tank. Go slower around corners, keep more fuel in it and/or dont worry about it.

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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