TM 9-2815-225-34&P 3-55.  FUEL INJECTOR TESTING; TEST NO. 3 (Contd) LOCATION/ITEM ACTION REMARKS c.  Testing Check Ball Seating NOTE Hold injector in hand; do not place in test stand holding device. 34. Plunger (40) Hold plunger (40) down in injector Injector assembly (39) must be in assembly (39). vertical position. 35. Start-stop switch (6) Place in start position. 36. Pressure regulator (15) Adjust to 150 psi (1034 kPa) on fuel pressure gauge (3). 37. Orifice plug inlet opening Check for leakage. Plunger (40) must be seated (45) in cup.  If leakage is observed, check ball must be replaced. Slight seepage is acceptable. 38. Start-stop switch (6) Place in stop position. 39. Fuel inlet connector (30) Disconnect from adapter (28). 3-372