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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    It may be necessary to remove engine components for the visual inspections.

  1. Verify the following conditions do not exist:
    • Hoses and lines that are flattening when the engine is running, or have kinks that would restrict the flow of fuel
    • Fuel leaks between the fuel tank and the fuel injection pump
      • NOTE:

      A fuel return line that is leaking, is a good indication there is a restriction in the return system.

    • Fuel leaks in the fuel return lines
    • If any conditions exist 

      Repair or replace as necessary.

    • Go to next step: If no conditions exist 
  2. Ignition OFF, disconnect the fuel supply outlet hose at the fuel filter assembly.
  3. Install the CH-37287-1A  Fuel Pressure Gauge Adapter and attach the CH-48027  Digital Fuel Pressure Gauge.
  4. Ignition ON, verify the fuel pressure is between 414-550 kPa (60-80 PSI).
    • If not within 414-550 kPa (60-80 PSI) 
    1. Ignition OFF.
    2. Reassemble the outlet hose at the fuel filter assembly.
    3. Disconnect the fuel supply inlet hose at the fuel filter assembly.
    4. Install the CH-37287-1A  Fuel Pressure Gauge Adapter and attach the CH-48027  Digital Fuel Pressure Gauge.
    5. Ignition ON, verify the fuel pressure is between 414-550 kPa (60-80 PSI).
      • If not within 414-550 kPa (60-80 PSI), replace the G12 Fuel Pump.
      • If within 414-550 kPa (60-80 PSI), replace the fuel filter.
    • Go to next step: If within 414-550 kPa (60-80 PSI) 
  5. Reassemble the hoses at the fuel filter assembly.
  6. Verify engine cranks and runs smoothly.
    • Go to next step: If engine cranks and runs smoothly 
  7. All OK
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