FUEL
SYSTEM
AWARNING:
Shut
off
the
fuel
valve
at
the
tank
when
servicing
the
fuel
system.
Take
care
in
catching
any
fuel
that
may
spill. 00
NOT
aI/ow
any
smoking,
open
flames
or
other
sources
of
fire
near
the
fuel
system
when
ser-
vicing.
Ensure
proper
ventilation
exists
when
servicing
the
fuel
system.
FUEL
FILTERS
The fuel injection pump and the fuel injectors are precisely
manufactured and they must receive clean diesel
fuel, free
from water and dirt. To ensure this flow
of
clean fuel, the fuel
must pass through at least two fuel filters, a fueVwater sepa-
rator and the
engine'5 spin-on fuel filter. Visually inspect,
clean, and change these
filters according
to
the maintenance
schedule
in
this manual.
I. Shut fuel supply off.
2.
Loosen the fuel filter, turning counterclockwise with a fil-
ler wrench.
3.
Using a rag, wipe clean the sealing face on the housing
bracket
so
the new filter can
be
seated properly.
4.
Lightly oil the sealing O-ring on the new filter.
To
re,in-
stall, turn the filter assembly clockwise carefully until the
O-ring contacts the sealing surface
of
the housing bracket.
Tum
2/3
further with the filter wrench.
5.
Tum
on the fuel and start the engine.
The
nonnal preheat
function should quickly prime the system and the engine
should start.
NOTE:
The cartridge contains fuel.
Take
care not 10 spill
it
during disassembl". Peiform the PRIMING
TIlE
FUEL
SYSTEM after replacing the spin-on
Jilt"
FUEL
FILTER
TO
INJECTORS
SPIN-ON
FUEL
FILTER
18
FUEL
WATER
SEPARATOR
A primary fuel filter
of
the water separating type must be
installed between the fuel tank and the engine
to
remove
water and other contaminants from the fuel before they can
be carried to the fuel system on the engine.
Most installers include a lype
of
filter/water separator with
the installation package as they are aware
of
the problems
that contaminants in the fuel can cause.
A typical fuel filter/water separator
is
illustrated in this dia-
gram. This
is
the Rayeor Model
500
MA. Keep
in
mind that
if a water separator type filter
is
not installed between the
fuel supply tank and engine-mounted fuel
system, any water
in
the fuel will affect the fuel pump, engine filter, and injec-
tion equipment. The owner/operator
is
responsible for making
certain the fuel reaching the
engine"s injection equipment
is
free
of
impurities. This process
is
accomplished
by
installing
and maintaining a proper filtration/separation system.
TO
ENGINE
DRAIN
FROM
FUEL
TANK
FUEL
FILTER
WATERISEPARATOR
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