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Home >> GMC >> 1998 >> Forward Control 4.3 W, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls - System & Component Testing - 6.5L Turbo Diesel) >> Fuel System >> Injectors >> Opening Pressure Test

Opening Pressure Test

WARNING: This page is about a different variant/trim than selected.
  1. Open tester shutoff valve 1/4 turn from closed position. Slowly depress tester lever and observe gauge. Note pressure at which needle of pressure gauge stops. Some injector nozzles may pop while other injector nozzles may drip (this is not a leak).
  2. Injector opening pressure should not fall to less than 1500 psi (105 kg/cm2 ). Replace any injector nozzle where measurement does not meet lowest acceptable pressure. Release tester pressure.