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 (right figure) and operation (below 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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