>Why does it need polishing???
If you run on low tanks most diesels recirculate fuel fast enough to "polish " it free.<
This depends on the engine selected.
A DD runs huge GPH 25+ thru the engine filters every hour , so eventually the fuel IS polished.
Many other injector schemes return minor fuel, basically internal fuel pump leakage , so do a very poor job of cleaning any fuel except what is consumed.
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