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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls - 6.6L - Troubleshooting & Diagnosis) >> Fuel Heater Always On >> Circuit/System Testing

Circuit/System Testing

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Check the Water in Fuel lamp for proper operation. Refer to Water-in-Fuel Lamp Always On .

  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the fuel heater connector.
  3. With the fuel temperature above 21°C (70°F), test for continuity between the ignition 1 voltage terminal and the fuel filter/heater element housing.
    • If continuity was present, the thermostatic switch is stuck ON. Replace the fuel filter/heater element housing.
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