10.3.4. Fuel feed pump
1) General descriptions and construction
The P-type injection pump is mounted with K-ADS or KP type feed pump. These pumps have
the same basic construction and operation, and the general descriptions of the KP type
pump are given below:
The figures show its construction (above figure) and operation (following figure). The piston in
the fuel feed pump is driven by the push rod and tappet via the camshaft of injection pump and
performs reciprocating operation to control the suction and delivery of fuel. When the cam
reaches the Bottom Dead Center as shown in the figure, the fuel is drawn in through the check
valve on the inlet side.
The fuel pressurized as the cam rotates on flows through the check valve on the outlet side as
shown in (B). If the feeding pressure increases abnormally, the spring is compressed, resulting
in interrupting further delivery of fuel as shown in (C).
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