LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1987 >> Forward Control 6.2 J, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - 6.2L Diesel >> Testing >> Injectors >> Opening Pressure Test
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Opening Pressure Test

  1. Open tester shutoff valve 1/4 turn. Slowly depress tester lever and observe gauge. Note pressure at which needle stops.
  2. Maximum pressure observed is opening pressure. Lowest acceptable pressure is 1500 psi (105 kg/cm2 ). Replace any injector which does not meet lowest acceptable pressure. Release tester pressure.