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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 Leak Diagnosis >> Circuit/System Verification

Circuit/System Verification

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  1. Perform the following action: Clean all of the components in the suspected area using a cleaning solution and allow the components to dry: Fuel System
  2. Perform the following action: Add 237 mL (8 US fl oz) of GM Approved Oil Dye to the component: Fuel Tank - Primary
  3. Engine - Idling - For 3 to 5 min
  4. Perform the scan tool control function: Fuel Pressure Control - Regulator 1 - Increase - Maximum Pressure - If applicable
  5. Use the special tool: J-28428-E  High-Intensity Black Light Kit or J-42220  Universal 12 V Leak Detection Lamp - Illuminate the area(s) of concern.
    CAUTION: When performing a Fuel Leak Diagnosis, it is VERY IMPORANT to use only GM approved Oil Dye, Part Number 88861206. If any other oil dye is used, it will cause damage to the fuel injection system components, as well as the emission control components. This will result in necessary replacement of the damaged components.

    Verify there are no leaks in the component/system: High Pressure Side of the Fuel System or Return Side of the Fuel System

    • {High Pressure Side of the Fuel System} If a leak is present 

      Repair or replace as necessary.

    • Go to next step: If no leak is present 
  6. All OK.
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