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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 Testing >> Alcohol in Fuel Testing with Special Tool, If Available

Alcohol in Fuel Testing with Special Tool, If Available

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. Test the fuel composition using CH 44175 - A  Alcohol Tester Kit and Instruction Manual.
  2. Verify no water appears in the fuel sample.
    • If water appears in the fuel sample 

      Clean the fuel system.

    • Go to next step: If no water appears in the fuel sample 
  3. Subtract 50 from the reading on the DMM in order to obtain the percentage of alcohol in the fuel sample.
  4. Verify the non-blended gasoline fuel sample does not measure greater than 15% or an E85 blended gasoline fuel sample measures greater than 91% ethanol.
    • If greater than the specified value 
    1. Add fresh regular gasoline to the vehicle's fuel tank.
    2. Remove a new sample of fuel from the tank.
    3. Test the fuel composition using CH 44175 - A  Alcohol Tester Kit and Instruction Manual.
    4. Subtract 50 from the reading on the DMM in order to obtain the percentage of alcohol in the fuel sample.
    5. Verify the non-blended gasoline fuel sample does not measure greater than 15% or an E85 blended gasoline fuel sample measures greater than 91% ethanol.
      • If additional testing indicates that the ethanol percentage is still above 15% for a non-blended gasoline sample, drain and replace the vehicle's fuel. Refer to Fuel Tank Draining .
      • If additional testing indicates that the E85 blended gasoline sample still measures above 91%, continue adding fresh, regular gasoline until the ethanol content is 85% or less.
    • Go to next step: If the specified value or less 
  5. All OK.
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