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Diagnostic Procedure

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  1. If water-in-fuel light is operating properly, go to next step. If water-in-fuel light is not operating properly, perform water-in-fuel light diagnosis. See WATER-IN-FUEL LIGHT ALWAYS ON (6.5L)  or WATER-IN-FUEL LIGHT INOPERATIVE (6.5L)  .
  2. Disconnect fuel heater harness connector and remove heater from filter housing. With fuel heater at room temperature, connect ignition voltage circuit of fuel heater to battery voltage and connect ground circuit of fuel heater to ground. Observe heater element. Does heat occur? If yes, go to step  4. If no, go to next step.
  3. Cool sensor part of fuel heater with ice. With fuel heater below 46°F (8°C), wet heating element with fuel. Connect ignition voltage circuit of fuel heater to battery voltage and connect ground circuit of fuel heater to ground. Observe heating element. Does heat occur? If yes, go to step  5. If no, go to next step.
  4. Replace fuel heater. After repairs, go to next step.
  5. Operate vehicle under which problem was noted. Does system operate properly? If yes, system is okay. if no, go to step  1.
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