Professional BoatBuilder - April-May 2018

50 PROFESSIONAL BOATBUILDER

(this is the upper threshold for dis-

solved water in various international

standards). I use the water test on die-

sel from the secondary fuel  lter when

I change it. I want to see if dissolved

water is making its way through the

water-separating  lter element in the

primary  lter. I use the bacteria test on

a sample of fuel drawn from the bottom

of the tank, the most likely point for

concentrations of bacteria.

My goal is to never again have to

haul the diesel o my boat in milk

jugs, or to have a yard technician open

up the tank to clean it out.

About the Author: A contributing editor

of Professional BoatBuilder, Nigel Calder

is the author of Boatowner’s Mechanical

and Electrical Manual and other marine

titles (including, earlier in his career,

Marine Diesel Engines), and is a mem-

ber of the American Boat & Yacht Coun-

cil’s Electrical Project Committee.

Water and bacteria test kits. Top—Fuel

from the secondary  lter is tested to see

if entrained water is passing through the

primary  lter’s water-separating  lter.

Left and below—A fuel sample from the

base of the fuel tank is tested for bacterial

contamination.

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FUEL SYSTEMS: Diesel Fouling

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