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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 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 does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure Relief .
  2. Install the CH - 37287 - 1A  Fuel Pressure Gauge Adapter between the fuel feed pipe and the fuel rail.
  3. Open both of the valves on the CH - 37287 - 1A  Fuel Pressure Gauge Adapter.
  4. Ignition ON, command the Fuel Pump Enable ON with a scan tool.
  5. Close one of the valves on the CH - 37287 - 1A  Fuel Pressure Gauge Adapter.
  6. Verify that the Fuel Pressure Sensor parameter does not decrease greater than 34 kPa (5 psi) in 1 minute.
    • If the fuel pressure drops 

      Test or replace the G12 Fuel Pump.

    • Go to next step: If the fuel pressure does not drop 
  7. Locate and replace the leaking Q17 Fuel Injector.
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