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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