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 MANUALSCHEVROLET2002SILVERADO 1500 HD, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM & COMPONENT TESTINGFUEL SYSTEM (DIESEL)WATER-IN-FUEL LIGHT ALWAYS ON (6.5L)DIAGNOSTIC PROCEDURE
2002 Chevrolet Silverado 1500 HD, RWD
Diagnostic Procedure
2002 Chevrolet Silverado 1500 HD, RWDSECTION Diagnostic Procedure
- Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 6.5L CAB & CHASSIS, CHEVY EXPRESS & SAVANA article. After performing Diagnostic System Check - Engine Controls, go to next step.
- Turn ON the ignition, with the engine OFF. Does water-in-fuel light illuminate briefly, then go out? If yes, go to step 4. If no, go to next step.
- Does water-in-fuel light stay ON? If yes, go to step 5. If no, go to.WATER-IN-FUEL LIGHT INOPERATIVE (6.5L)
- Operate vehicle under conditions which problem was noted. Does system operate normally? If yes, system is okay. If no, go to step 2.
- Disconnect water-in-fuel sensor harness connector. Turn ON the ignition, with the engine OFF. Probe Water-In-Fuel Indicator Control circuit at harness connector with Test Light (J 34142-B) connected to battery voltage. Does test light illuminate? If yes, go to next step. If no, go to step 7.
- Repair short to ground in Water-In-Fuel Indicator Control circuit. After repairs, go to step 8.
- Replace water-in-fuel sensor. After repairs, go to next step.
- Start engine. Operate vehicle within conditions under which problem was noted. Does system operate normally? If yes, system is okay. If no, go to step 2.
NOTE:
Before proceeding with this step, drain any water from fuel system.
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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.