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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> Alcohol/Contaminants-in-Fuel Diagnosis >> Circuit/System Testing

Circuit/System Testing

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Alcohol in Fuel Testing with Special Tool

  1. Test the fuel composition using CH 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 fuel sample contains more than 15% ethanol, add fresh, regular gasoline to the fuel tank.
  5. Test the fuel composition.
  6. If testing shows the ethanol percentage is still more than 15%, replace the fuel in the vehicle.

Alcohol in Fuel Testing without Special Tool

  1. Using a 100 ml (3.38 oz) specified cylinder with 1 ml (0.034 oz) graduation marks, fill the cylinder with fuel to the 90 ml (3.04 oz) mark.
  2. Add 10 ml (0.34 oz) of water in order to bring the total fluid volume to 100 ml (3.38 oz) and install a stopper.
  3. Shake the cylinder vigorously for 10-15 s.
  4. Carefully loosen the stopper in order to release the pressure.
  5. Reinstall the stopper and shake the cylinder vigorously again for 10-15 s.
  6. Put the cylinder on a level surface for approximately 5 min in order to allow adequate liquid separation. If alcohol is present in the fuel, the volume of the lower layer, which may now contain both alcohol and water, will be more than 10 ml (0.34 oz). For example, if the volume of the lower layer is increased to 15 ml (0.51 oz), this indicates at least 5% alcohol in the fuel. The actual amount of alcohol may be somewhat more because this procedure does not extract all of the alcohol from the fuel.

Particulate Contaminants in Fuel Testing Procedure

  1. Using an approved fuel container, draw approximately 0.5 L (0.53 qt) of fuel.
  2. Place the container on a level surface for approximately 5 min in order to allow for the particulate contamination to settle. Particulate contamination will show up in various shapes and colors. Sand will typically be identified by white or light brown crystals. Rubber will appear as black and irregular particles.
  3. Observe the fuel sample. If any physical contaminants or water are present, clean the fuel system.
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