6. Fuel injection equipment
147
6.3 Fuel filter
The fuel filter is installed between the feed pump and
injection pump, and serves to remove dirt and impurity
from the fuel fed from the fuel tank through the feed
pump.
The fuel filter incorporates a replaceable filter paper
element.
Fuel from the fuel tank enters the outside of the element
and passes through the element under its own
pressure.
As it passes through, the dirt and impurity in the fuel are
filtered out, allowing only clean fuel to enter the interior
of the element.
The fuel exits from the outlet at the top center of the
filter and is sent to the injection pump.
A cross-headed hexagonal bolt is fitted to the fuel filter
body.
Loosen the bolt with a cross-headed screw driver
before starting or after dismantling and reassembly to
bleed the air in the fuel system to the fuel filter.
6.3.1 Fuel filter specifications
6.3.2 Fuel filter inspection
The fuel filter must be periodically inspected. If there is water and sediment in the filter, remove all dirt,
rust, etc. by washing the filter with clean fuel.
The normal replacement interval for the element is 250 hours, but the element should be replaced
whenever it is dirty or damaged, even if the 250 hour replacement period has not elapsed.
Filtering area
333 cm
2
(20.3 in.
2
)
Material of element
Cotton fiber
Filter mesh
10-15
µ
From feed
pump
To
injection
pump
Air bleeding bolt
Nylon gasket
Fuel filter body
O-ring
Element
Filter cup
Retaining ring
Summary of Contents for 3YM20
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