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Keep the Fuel in Your Standby Diesel Generator Absolutely Clean & Dry with a Fuel Polishing System

  • Mar 11, 2025
  • 2 min read

Updated: Dec 16, 2025

Fuel Polishing System | Oil Filtration Systems

Left stagnant for long periods of time, the diesel fuel in bulk fuel tanks or belly tanks can become contaminated with moisture due to humidity in the air, and algae can then form at the fuel/air interface.  Left unchecked, moisture, algae, fungus, sludge, and other particulate matter will contaminate the fuel, which can then cause problems with start-up and operation of the diesel engine when it is needed most - during an emergency!

 

A Fuel Polishing System will recirculate the fuel inside the bulk tank or day tank, creating convection and movement, which helps prevent the formation of algae at the fuel/air interface.  At the same time, a Fuel Polishing System will effectively filter the fuel, removing both particulate and moisture contamination.     

 

This is not a “one size fits all” solution; the Fuel Polishing System must be sized properly with a high enough flow rate to create some convection within the fuel tank and enough turnover for effective filtration.

 

Design features:

 

  • Positive displacement gear pump directly coupled to a premium efficiency electric motor

  • High efficiency, absolute-rated 4-Micron filter elements (Beta>1000 per ISO 16889) for particulate removal

  • Coalescer/separator elements or water-absorbing filter elements for effective removal of free water from diesel fuel

  • Compact NEMA 4 electric control panel with pushbutton on-off switches, “Plugged Filter” indicator lights, and programmable timer (if necessary)  

 

Let the experts at Oil Filtration Systems help design and size a Fuel Polishing System for your specific application!  We can help make recommendations about proper configuration and installation for optimal performance, and we can arrange for a site visit to meet with you and your team if necessary. 


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