Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1983STEP VAN P20, 4.8 T, AUTOMATIC, 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - DIESELTESTINGINJECTION NOZZLEOPENING PRESSURE TEST
1983 Chevrolet Step Van P20, 4.8 T, Automatic, 475/M40
Opening Pressure Test
1983 Chevrolet Step Van P20, 4.8 T, Automatic, 475/M40SECTION Opening Pressure Test
- Open tester shut off valve to pressure gauge 1/4 turn. Slowly depress tester lever and observe pressure gauge. Note pressure at which needle stopped, indicating pressure increase (nozzle does not chatter) or at which pressure the pressure dropped substantially (nozzle chatters).
- The maximum pressure is the opening pressure. Lowest acceptable pressure is 1500 psi (105 kg/cm2 ). Replace any nozzle which does not meet lowest acceptable pressure. Release tester pressure.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.