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53. When a nozzle tester is being used to test a «closed» type fuel injection nozzle, a clogged nozzle orifice will be indicated by a __________.
A clogged nozzle orifice restricts fuel flow, resulting in a distorted spray pattern. This visual indication on a nozzle tester directly reflects the blockage, unlike sounds associated with normal nozzle operation or pump function.
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