Westerbeke W-46 - Page 65

FUEL SYSTEM
3. Fuel Pump
#301385
This is a solenoid-opera ted
{transistor type) 12-Volt DC
fuel pump. The reciprocating
motion of the pump plunger is
controlled by a transistorized
circuit.
5
4
3
2
11) Cover
(2}
Cover gasket
(3)
Magnet
(4)
Filter
(5} Body
( 6) Spring retainer
< 7l w""" 1 \
. ( 8) 0-ring 6 ·
( 9) Valve ~
(I 0) Plunger spring
(11)
Plunger
(12) Plunger tube
10
9
Disassembly and Reassembly of the Electric Fuel Pump for Cleaning
Because this transistorized fuel pump is totally enclosed, only
the cover, filter and plunger assembly require cleaning.
Using a 17-mm wrench, remove the cover {1). {See illustration)
Then, the cover gasket { 2) , magnet ( 3) ·and filter ( 4) can be removed
from the pump body (5). Replace the filter as needed.
Check the cover gasket, and if damaged, replace it. Clean the magnet
and cover thoroughly.
To remove the plunger, first remove the spring retainer (6) from the
plunger tube (12) • Then remove the washer (7) , O-r ing seal (8),
valve (9), plunger spring (10) and plunger (11) from inside the tube.
Wash these parts in clean diesel oil and remove the oil and other con-
taminants using compressed air.
CAUTION The plunger tube { 12} has very small wall thickness. Be
careful not to deform the tube during removal of the plunger
parts. Carefully handle the plunger to prevent it from
being dented or otherwise damaged.
( 1)
To assemble,
and washer,
retainer.
install the plunger, plunger spring, valve, O-r ing
in that order, and secure assembled parts with the
(2) Install the filter element, and then the magnet and gasket in the
cover and tighten the cover with a 17-mm wrench to the ends
of the slotted stop.
Checking the Electric Fuel Pump
.
Turn on the ignition switch (for a generator, use PREHEAT). The pump should
produce a clicking sound. If the pump does not produce any operating
sound, check with a DC voltmeter to determine that 12 Volts is being
supplied to the pump. If 12 Volts is being supplied to the pump and
the pump still does not make any operating sound, replace the fuel
pump assembly. If 12 Volts is not present at the pump, check the unit
circuit breaker, electrical connections and switch. Fuel delivery
(free flow) is 225cc (. 4 8 pints) every 15 seconds. The electrical
fuel pump should maintain a positive fuel inlet pressure to the injec-
tion pump during engine operation.
63