Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 136 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)FUEL SYSTEMSALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS (WITH SPECIAL TOOL)TEST PROCEDURE
2006 Chevrolet Suburban C1500, 5.3 Z
Test Procedure
2006 Chevrolet Suburban C1500, 5.3 ZSECTION Test Procedure
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
- Test the fuel composition using Fuel Composition Tester (J-44175) and Instruction Manual (J-44175-3).
- If water appears in the fuel sample, perform the following steps:
- Clean the fuel system. See FUEL SYSTEM CLEANING under FUEL SYSTEMS in REMOVAL & INSTALLATION - CORVETTE article.
- Replace the fuel filter for vehicles without the FFS fuel system. See FUEL FILTER/PRESSURE REGULATOR under FUEL SYSTEMS in REMOVAL & INSTALLATION - CORVETTE article.
- Subtract 50 from the reading on the DVOM in order to obtain the percentage of alcohol in the fuel sample.
- If the fuel sample contains more than 15 percent ethanol, add fresh, regular gasoline to the vehicle's fuel tank.
- Test the fuel composition.
- If testing shows the ethanol percentage is still more than 15 percent, replace the fuel in the vehicle. See FUEL SYSTEM CLEANING under FUEL SYSTEMS in REMOVAL & INSTALLATION - CORVETTE article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.