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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 364 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - DTC P0443 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> Alcohol/Contaminants-in-Fuel Diagnosis >> Alcohol in Fuel Testing with Special Tool

Alcohol in Fuel Testing with Special Tool

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Test the fuel composition using J 44175  Fuel Composition Tester and Instruction Manual.
  2. If water appears in the fuel sample, clean the fuel system.
  3. Subtract 50 from the reading on the DMM in order to obtain the percentage of alcohol in the fuel sample.
  4. If the non-blended gasoline fuel sample measures more than 15 percent ethanol, or if the E85 blended gasoline fuel sample measures more than 91 percent ethanol, add fresh regular gasoline to the vehicles's fuel tank.
  5. Test the fuel composition.
  6. If additional testing indicates that the ethanol percentage is still above 15 percent for a non-blended gasoline sample, drain and replace the vehicle's fuel. Refer to Fuel Tank Draining (Dual Tanks - Front) , Fuel Tank Draining (Dual Tanks - Rear) , Fuel Tank Draining (Single Tank) . If additional testing indicates that the E85 blended gasoline sample still measures above 91 percent, continue adding fresh, regular gasoline until the ethanol content is 85 percent or less.
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