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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 >> Alcohol/Contaminants-In-Fuel Diagnosis >> Circuit/System Verification

Circuit/System Verification

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  1. Remove a sample of fuel from the bottom of the fuel tank and place in a clean, clear container.
  2. Place the sample on a level surface for 2 min.
  3. Verify the sample is clear and bright in color.
    • If the sample appears cloudy, or contaminated with water, as indicated by a water layer at the bottom of the sample 

      Refer to Circuit/System Testing - Particulate Contaminants in Fuel.

    • If alcohol contamination is suspected 

      Refer to Circuit/System Testing - Alcohol in Fuel Testing.

    • Go to next step: If the sample remains clear and bright 
  4. All OK.
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