The Water In Fuel (WIF) light on a 6.7 Powerstroke diesel engine is an important warning indicator that should not be ignored. When this light illuminates, it signals the presence of water in the fuel system, which can cause significant damage if left unaddressed. Here's a comprehensive guide on how to reset the WIF light and address the underlying issue.

Draining the Fuel Filter

The first step in addressing a WIF light is to drain the fuel filter:

1. Locate the fuel filter assembly under the vehicle, near the fuel tank.

2. Place a container under the drain valve to catch the fuel.

3. Open the drain valve and let the fuel flow until it runs clear, with no visible water.

4. Close the drain valve securely.

After draining, if the light doesn't reset automatically, you may need to perform additional steps.

Priming the Fuel System

To ensure the system is free of air and properly primed:

1. Turn the ignition key to the "On" position without starting the engine.

2. Wait for 30 seconds to allow the fuel pump to run.

3. Turn the key off and repeat this process 6-10 times.

This procedure helps purge air from the fuel system and can often reset the WIF light.

Resetting the WIF Sensor

If the light persists, you may need to reset the WIF sensor:

1. Disconnect the negative battery terminal for about 30 minutes.

2. Reconnect the battery and start the engine.

3. If the light remains on, use a diagnostic scan tool to clear the codes.

Inspecting the WIF Sensor

Sometimes, the issue may be with the sensor itself:

1. Locate the WIF sensor at the bottom of the fuel filter housing.

2. Inspect the sensor and its connections for signs of corrosion or damage.

3. Clean the sensor contacts with electrical contact cleaner if necessary.

4. Ensure the sensor is properly seated and connected.

Checking for Wiring Issues

Wiring problems can cause false WIF readings:

1. Inspect the wiring harness connected to the WIF sensor.

2. Look for any signs of wear, chafing, or exposed wires.

3. Pay special attention to areas where the wiring may rub against the fuel tank or frame.

4. Repair or replace any damaged wiring as needed.

Professional Diagnosis

If these steps don't resolve the issue, it's time to seek professional help:

1. Have a certified technician perform a comprehensive fuel system inspection.

2. They may use advanced diagnostic tools to identify any underlying issues.

3. In some cases, the fuel system may require a complete flush and filter replacement.

Preventive Measures

To avoid future WIF light issues:

  • Use high-quality fuel from reputable stations.
  • Consider using a fuel additive designed to prevent water accumulation.
  • Regularly drain the fuel/water separator, especially in humid climates.
  • Keep your fuel tank as full as possible to minimize condensation.

By following these steps, you can effectively reset the 6.7 Powerstroke Water In Fuel light and maintain the health of your diesel engine. Remember, persistent WIF issues should always be addressed promptly to prevent potential engine damage.

FAQs About 6.7 Powerstroke Water In Fuel Light Reset

    • How often should I drain my fuel filter?
      It's recommended to drain the fuel filter every oil change or if the WIF light comes on.
    • Can I drive with the WIF light on?
      It's not recommended. Driving with water in the fuel can cause serious engine damage.
    • Why does water get in my diesel fuel?
      Water can enter through condensation in the tank or contaminated fuel sources.