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HOMESERVICE MANUALSCHEVROLET2001SUBURBAN C1500REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 15 (ENGINE CONTROLS - 6.5L - TROUBLESHOOTING)FUEL HEATER INOPERATIVETEST DESCRIPTION
2001 Chevrolet Suburban C1500

Test Description

2001 Chevrolet Suburban C1500SECTION Test Description
WARNING: This page is about a different car, the 2001 GMC C3500 HD and 2001 Chevrolet C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step checks for a fuel heater that is stuck ON.
  2. 3:  This steps checks for a thermostatic switch that completes the circuit.
Fuel Heater Inoperative

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
1 Does the Water-In-Fuel lamp operate properly? Go to Step 2  Go to Water-in-Fuel Lamp Inoperative  or Water-in-Fuel Lamp Always On 
2 
  1. Disconnect the fuel heater connector and remove the fuel heater from the filter housing.
  2. With the fuel heater at room temperature, connect the ignition voltage circuit of the fuel heater to B+ and connect the ground circuit of the fuel heater to ground.
  3. Observe the heater element.
Does heat occur?		 Go to Step 4  Go to Step 3 
3 
  1. Cool the sensor part of the fuel heater with ice.
  2. With the fuel heater below 8°C (46°F), wet the heating element with fuel.
  3. Connect the ignition voltage circuit of the fuel heater to B+ and connect the ground circuit of the fuel heater to ground.
  4. Observe the heating element.
Does heat occur?		 Go to Step 5  Go to Step 4 
4 Replace the fuel heater. Refer to Fuel Heater Element Replacement .
Did you complete the repair?		 Go to Step 5  -
5 Operate the vehicle under which the problem was noted.
Does the system operate properly?		 System OK Go to Step 1 
RENDER: 1.0x

NO RELATED

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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.