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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Controls And Fuel - 6.0L (L96) - DTC P0351 To DTC P2636 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> Fuel System Diagnosis >> Circuit/System Testing >> Fuel Pressure Leaks Down

Fuel Pressure Leaks Down

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Open the both valves on the CH-37287-1A  Fuel Pressure Gauge Adapter.
  2. Ignition ON, command the Fuel Pump Enable ON with a scan tool.
  3. Close the valve between the gauge and fuel tank on the CH-37287-1A  Fuel Pressure Gauge Adapter.
  4. Verify that the Fuel Rail Fuel Pressure parameter does not decrease greater than 34 kPa (5 psi) in 1 minute.
    • If the fuel pressure drops 

      Locate and replace the leaking Q17 Fuel Injector.

    • Go to next step: If the fuel pressure does not drop 
  5. Test or replace the G12 Fuel Pump.
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