(57) In a common-rail fuel injection system, measurement data on a pressure feed rate
characteristic, reflecting diverse individual differences among supply pumps (6),
is divided into N portions which in turn are ranked and encoded to produce ranked
pressure feed rate characteristic codes (21), and one of the ranked codes (21) is
distinguishably put or printed on a portion of the pump (6) confirmable or visible
from the external. Moreover, measurement data on a leak rate characteristic, reflecting
diverse individual differences of injectors (4), is divided into M portions which
in turn are ranked and encoded, and one of the resultant ranked leak rate characteristic
codes (22) is distinguishably put or printed on a portion of the injector (4) confirmable
from the external. This enables the pressurization performance of the system to be
enhanced without requiring a considerable structure alteration of the pump (6).
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