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I run a Fuel Manager 30 micron pre-filter with the optional electronic water sensor. They have a good reputation for early water contamination alert whereas the factory sensor is not as sensitive, as some ZD owners have unfortunately experienced.
The Fuel Manager filter is much easier to replace than the factory unit and will extend the useful life of the factory unit.
I also run a Carter 4600 as lift pump and it all works well with a 150kw TD42T.