Deck Fill Protection Device
Manufactured by Marsh Marine...Tank Cleaning Professionals
“Our experience is your protection since 1966”
Diesel Fuel...Continued:
A
rmed
with
these
facts,
let’s
explore
some
of
the
myths
about
diesel
fuel:
It
is
commonly
believed
that
diesel
fuel
is
stable;
pour
it
into
your
tank
and
forget
about
it.
Bad
mistake!
As
I
mentioned
earlier,
today’s
diesel
fuel
is
not
what
it
used
to
be
and
in
fact
it
begins
to
deteriorate
after
only
three
months
in
calm
storage
(typical
situation
of
most
boats).
Heat,
oxidation,
the
pressure
of
fuel
pumps
and
injectors
all
begin
to
affect
quality.
Little
by
little
the
chemistry
of
the
fuel
begins
to
deteriorate
at
the
molecular
level.
Minute
particles
form
and
much
like
magnets
they
attract
one
another,
forming
an
ever
larger
mass.
This
process
is
called
agglomeration
which
is
really
the
fuel
returning
to
its
natural
state.
Over
time
the
mass
appears
to
grow
and
forms
a
heavy
gooey
sludge.
It
clings
to
tank
walls
and
settles
to
the
tank
bottom.
Your
first
indication
might
be
dirty
fuel
filters.
You
may
think
you
have
algae
growing
in
your
tank.
Tain’t
so.
It
is
a
misconception
that
algae
grow
in
diesel
fuel.
Algae
are
a
green
plant
whose
life
process
requires
chlorophyll.
Green
plants
must
have
sunlight
to
produce
chlorophyll.
Algae
cannot
survive
let
alone
grow
in
the
light-less
recess
of
your
fuel
tank.
Though
the
dark
brown
to
black
deposits
may
seem
to
be
alive
because
they
increase
in
mass,
they
are
actually
inert,
totally
dead.
So
what
are
they?
This
goop
is
collectively
called
Asphaltenes.
It
is
one
of
the
two
major
enemies
of
your
fuel.
The
other
is
water
which
we
will
discuss
next.
Before
someone
sends
me
nasty
emails,
let
me
clarify
that
though
algae
cannot
live
in
diesel
fuel,
some
forms
of
bacteria
and
fungi
can,
but
these
are
very,
very
seldom
the
cause
of
major
fuel
problems.
In
short,
if
you
leave
your
diesel
fuel
stored
for
long,
idle
periods,
it
is
going
to
breakdown
forming
asphaltene
sludge.
T
he
second
fuel
culprit
is
water
contamination.
Water
in
diesel
is
death
to
your
engine,
make
no
mistake
about
it!
If
it
gets
past
the
filters
it
will
certainly
cause
engine
damage.
If
you
are
lucky,
just
your
injectors
will
be
ruined
since
water
will
destroy
their
hot
spray
tips.
Left
untreated
in
the
tank,
bacteria
and
fungi
can
grow
in
there.
In
combination
with
the
sulphur
naturally
found
in
diesel
fuel,
water
will
form
sulphuric
acid
and
corrode
aluminum
and
especially
black
iron
tanks.
In
virtually
every
older
Taiwanese
trawler
(which
typically
have
black
iron
tanks)
I’ve
worked
on,
there
has
been
iron
scale
caused
by
acid
fuel
corrosion.
You
may
feel
adding
one
of
the
biocide
chemicals
to
your
fuel
will
protect
against
microbial
contamination,
but
these
additives
actually
cause
more
harm
than
they
cure.
Even
if
the
product
does
kill
the
microbes,
it
does
not
remove
the
dead
growth
which
tends
to
cause even more clogging problems by sinking to the tank bottom.
S
o
where
does
water
come
from?
Some
of
you
are
not
going
to
like
the
answers,
but
stay
with
me.
Water
enters
your
tank
in
only
three
significant
ways:
fuel
you
take
on,
a
leak,
or
a
poorly
installed
vent.
First
let’s
deal
with
the
one
you
feel
I
failed
to
list,
condensation.
This
old
myth
dies
very
slowly,
but
studies
have
shown
that
very,
very
little
condensation
will
ever
enter
a
boat’s
fuel
tanks.
I
like
to
prove
this
one
with
a
demonstration
and
you
might
too.
Take
a
cold
drink
can,
a
beer
works
great!
Notice
how
the
sides
sweat.
This
is
water
vapor
from
the
warmer
ambient
air
condensing
on
the
cold
sides
of
the
can.
Next,
take
a
hot
cup
of
coffee,
notice
no
sweating.
Condensation
will
only
accumulate
on
the
walls
of
a
container
that
is
colder
than
the
outside
air.
This
is
a
situation
that
is
very
difficult
to
encounter
in
the
real
world.
Fuel
tanks
are
nearly
always
inside
the
boat
where
they
are
sheltered
from
the
colder
outside
air,
even
if
only
a
bit.
Okay,
you
say,
but
how
about
if
the
day
suddenly
heats
up
quicker
than
the
tank
and
fuel
within?
This
situation
would
be
rare,
but
even
if
it
did
occur,
the
moist
outside air can only enter the tank via the vent. Here is where science and math prevail.