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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 246 (Engine Controls - System & Component Testing - 6.6L) >> Fuel Systems >> Fuel Heater Always On >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Is the WATER IN FUEL light operating properly? If yes, go to next step. If no, diagnose warning light.
  2. Disconnect the fuel heater connector and remove fuel heater from filter housing. Filter housing is mounted on valve cover. With fuel heater at room temperature, connect the ignition 1 voltage circuit of the fuel heater to battery voltage and connect ground circuit of the fuel heater to ground. Observe heater element. Does heat occur? If yes, go to step  4 . If no, go to next step.
  3. Cool the sensor part of the fuel heater with ice. With the fuel heater below 46°F (8°C), wet the heating element with fuel. Connect ignition 1 voltage circuit of the fuel heater to battery voltage and connect ground circuit of the fuel heater to ground. Observe the heating element. Does heat occur? If yes, go to step  5 . If no, go to next step.
  4. Replace fuel heater. Fuel heater is located on fuel filter/heater element housing and is mounted on valve cover. After replacing fuel heater, go to next step.
  5. Operate vehicle under which the problem was noted. Does the system operate properly? If yes, system is okay. If no, go to step  1 .
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