Installation manual
FUEL
SYSTEM
BLEEDING
(PRIMING)
THE
FUEL
SYSTEM!20.0
KW
AND
25.0
KW
There is one bleed point
in
the on-engine fuel system to
open
for the removal
of
air. On the 20.0 KW and 25
KW
this bleed
screw
is
located on the housing for the spin-on fuel filter
mounted on the engine. This screw should be opened
one
or
two turns to remove air from the upper housing area
of
the
fuel filter. Energizing the preheat switch for
10-20
seconds
or
by using the palm
of
your hand to slowly depress
and
release
the primer pump on the
top
of
the filter housing either
method
will force air out through the bleed point.
Once
all
air
is
expelled, tighten the bleed screw. Depress the preheat
switch
10-20 seconds or slowly pumping the primer on the
fuel filter housing to force any air
in
the system between the
filter housing and the injection
pump
out
of
the system and
back to the fuel tank through the return.
NOTE:
When using the preheat junction to bleed air from the
filter assembly keep in mind that the preheat elements (glow
plugs) are being energized. Take care not to overheat them.
BLEEDING
(PRIMING)
THE
FUEL
SYSTEM/32.0
KW
To bleed the fuel system on the 32.0 KW Generators open
the bleed screw on top
of
the fuel filter and then locate the
fuel feed pump (see illustration).
Unscrew the knob on the fuel feed pump and the cylinder
will
pop up. Slowly work this priming pump by pulling the
knob fully upward and pushing
it
down to achieve a full
pumping stroke. Pump until free
of
air bubbles from the
open
bleed screw, then close the bleed screw.
Disconnect the fuel line return hose.
Place towels under the
hose and slowly pump the fuel feed pump again.
When
clear
fuel, free
of
air,
is
discharging frorn the line-stop pumping.
Reconnect the return line and work the purnp a few more
strokes. Then push the cylinder
in
and secure it.
Start the engine and check/correct any leaks.
Should unstable running occur open the nut that secures the
high pressure line to the injector to expel air in the line.
Loosen 1/2 to a
full turn place a cloth over the line and
wrench to catch the spurting fuel. When free
of
air retighten
the nut and proceed to the next injector line until the engine
runs smoothly.
~
FUEl
IN
-""
__
- ......
PRESSURE---....
GAUGE
---....
lOCATION
BLEED
SCREW
TO
FUEL
FILTER
FUEL
FILTER
(20
KW
•
25
KW)
8
PRIMER
(HAND)
PUMP
FUEL
PRESSURE
GAUGE
The
20
KW
and
25.0
KW
generators have a
connector
for an
in-line
gauge
at the secondary fuel filter .This
gauge
will
indicate the fuel inlet pressure. A positive fuel supply should
read
2.5
to 3.5 psi. Pressure below 1.5 psi will result in poor
engine
performance. Low pressure indicates unclean fuel
from
the
fuel water
separator
filter. A fuel pressure gauge can
be
purchased
thru
your
local marine store.
FUEL
ADDITIVES
If
fungus
or
bacteria
is
causing
fuel problems you should
have
an
authorized dealer correct these problems. Then use a
diesel fuel biocide to sterilize the fucl (follow the manufac-
turers instructions).
SPARES
While
the likelihood
of
having to service the system at sea
is
slim, the possibility does exist. Therefore,
we
recornmend
that
banjo
washers, injector seat washers, and a fuel filter be
carried
on
board at all times. Purchase needed spares from
your
local
WESTERBEKE
dealer
or
distributor. If a leak
should
develop at a banjo wa<ihcr that cannot be corrected hy
a
simple
tightening
of
the fitting, replace the sealing wa'iher
with a replacement found in the hardware kit for your model.
HIGH
PRESSURE
LINE
__
~
#t
tNJECTOR
(32
KW)
BLEED
SCREW
FUEL
STRAINER
TO
FUEl.--"~-!~
FUEL
FILTER
(32
KW)
FILTER;;;;~;~~
FtlTER
FUEL
FEED
PUMP
[32
KW)
PRtMER
(HAND)
PUMP
-FUEL
IN
,..yo
WESTERBEKE
Engines & Generators
18