Pearson P31-II, Manual

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4.3.2 Bacterial Contamination
A factor that can cause additional problems is bacterial
contamination of the diesel fuel. The bacteria involved
need both water and fuel to exist, and if present, will
thrive at the fuel/water interface in a fuel tank. As they
multiply, they form more water and a filter-choking brown
slime. Often their presence will not be known until rough
weather churns up the fuel tank causing clogged filters at
a most inopportune time.
Keeping water out of the fuel will, of course, prevent the
problem entirely, and while every effort should be made
toward this end, such as obtaining fuel from reputable
dealers, it must be remembered that a certain amount of
water due to normal condensation in the tank is to be
expected.
4.3.3 Fuel Additives
Fuel additives or conditioners provide another means of
combating this problem. These additives break the water
down to a molecular level, dispersing it throughout the
fuel and allowing it to pass harmlessly through the fuel
system. Various brands of this product are available at
marine supply stores. As with all products of this nature,
the directions on the can should be read carefully.
4.4
FUEL SYSTEM...GENERAL DESCRIPTION
The fuel system for your Pearson is illustrated in Fig. 4.2
and consists of one aluminum fuel tank, pick up tube, and
return lines, a fuel/water separator as a primary fuel
filter, and a secondary fuel filter on the engine.
4.5 FUEL SYSTE~.. FUELING
While employment of a diesel engine results in a greatly
reduced fuel hazard when compared to gasoline, it should be
remembered that diesel fuel is flammable, and that the
employment of good fueling practices are necessary. The
following steps are provide as guidelines.
4.5.1 Before Fueling
Extinguish all smoking materials and check the fueling area
for other sources of spark or flame. Remove if found.
Shut off the engine, and the electrical generator if one is
aboard.
De-energize all electrical equipment.
Close all hatches and ports.
Ensure that a fire extinguisher is readily available.