under the car. This is from the M110 280e FSM. yours is the same I believe.
1. unscrew protective case
2 Pinch fuel line with a clamp
3 unscrew fuel line from fuel filter
4 loosen both fastening screws and remove filter

installation is in reverse order. Make sure plastic sleeve is protecting filter from the metal bracket. Corrosion will occur if the metal touches the filter. Easy as 123. There wont be any U.S shop manuals available for that car. Its a euro spec 123. the 280e book will have most of the chassis info you need though.

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Chris
84 280sl
82 300d euro