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Engine_2014 : Motor Plants and Auxiliary Boilers - 1661/2614
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You are testing a closed fuel injection nozzle using a nozzle tester.  A pressure slightly less than design valve opening pressure is applied.  If no fuel appears at the spray tip, the __________.
A) nozzle orifices are too small
B) nozzle orifices are eroded
C) needle valve spring is defective
D) needle valve is operating properly
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