Question 1

How often should yacht fuel be polished?

Accepted Answer

Fuel polishing should be done at least every 6 months on yachts that sit for extended periods. Boats in active use with modern fuel-water separators can go 6-12 months between professional polishing. If you notice shorter filter life, sluggish acceleration or black soot on exhaust, polish immediately. Diesel fuel degrades faster in warm climates — a yacht in the Caribbean needs more frequent polishing than one in New England. Many yacht management companies schedule quarterly fuel polishing as standard maintenance.

Question 2

What does fuel polishing actually do?

Accepted Answer

Fuel polishing circulates your existing diesel through a multi-stage filtration system that removes water, microbial contamination (diesel bug), particulates, rust and asphaltenes. The fuel passes through water separators, 30-micron pre-filters and 2-micron final filters, then returns to the tank. The process also homogenizes the fuel, preventing stratification where water and contaminants settle to the bottom. A typical polishing session takes 4-8 hours per tank depending on volume and contamination level.

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