
Priming
and
Bleeding
the
Fuel System
The W
40NA engine has only one replaceable fuel filter located on the engine-mounted fuel system. This
fuel filter is located just after the discharge side of the mechanical fuel lift pump
Gust
below the fuel filter).
The manual-bleeding design
of
the fuel system allows the fuel filter
to
be easily serviced. To replace the fuel
filter, remove and replace filter elements as described in the "Replacing Filter
Elements", section
of
this
manual, page
35.
Be
careful to catch any fuel that may spill from within this fuel filter assembly.
NOTE: Any primary fuel filter/Water separator installed between the fuel tank and the engine's
fuel lift pump (that is, a Raycor, Dahl
or
other similar filters) should be manually filled before
an attempt
to
bleed the fuel system between the fuel tank and the engine is made.
To bleed remaining air from that portion
of
the fuel system which runs between the fuel tank and the engine,
once the primary fuel filter has been manually filled, move the mechanical fuel lift pump's priming lever
up
and
down
using steady, even strokes (one stroke per second) for a period
of
one minute. For this priming
operation,
no
fittings should be open. Refer
to
the illustration
of
the fuel system when following the proce-
dure described above, page 33.
Fuel Supply (IN)
Manual
Priming Lever
Mechanical Fuel Lift Pump
Refer
to
the illustration on the next page when following the procedures described below.
1.
After all air has been bled from between the fuel tank and the engine, proceed
to
either one
of
the two
bleed points
(#1)
located on
top
of the fuel filter (see the next page). Choose the one that
is
easily asses-
sable. Loosen the banjo bolt on top of the filter
or
the plug, on the side
of
the filter housing, one
to
two
turns. DO NOT remove the bolt or the plug.
2.
Move the priming lever
up
and down
(as
described on the previous page)
to
purge the air out of the secon-
dary fuel filter through the open banjo bolt
or
plug.
Westerbeke Diesel
Engines
32
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