The 2021 Ram 3500 with a Cummins diesel engine requires periodic fuel filter maintenance and resetting of the fuel filter life indicator. This guide will walk you through the process of resetting the fuel filter service light on your Ram 3500.

Locating the Fuel Filter Life Indicator

Some 2021 Ram 3500 models may not display the fuel filter life indicator on the dashboard. If you can't find this option while scrolling through your instrument cluster menu, don't worry - you can still reset the service light.

Resetting the Fuel Filter Service Light

To reset the fuel filter service light on your 2021 Ram 3500, follow these steps:

1. Turn the ignition to the "ON" position without starting the engine.

2. Press the brake pedal and push the start button twice without your foot on the brake.

3. Use the arrow buttons on your steering wheel to navigate through the instrument cluster menu.

4. Scroll down until you find the "Fuel Filter Life" option.

5. Once on the fuel filter life screen, press and hold the right arrow button.

6. You should see a "Reset" option appear. Select "Yes" to confirm the reset.

7. The fuel filter life should now reset to 100%.

If you don't see the fuel filter life option in your menu, try the following alternative method:

1. Navigate to the instrument cluster menu.

2. Look for an "Edit" or "Settings" option.

3. Within this menu, find and select the fuel filter life option to enable it.

4. Once enabled, follow the previous steps to reset the fuel filter life.

Importance of Fuel Filter Maintenance

Regular fuel filter maintenance is crucial for the performance and longevity of your Ram 3500's diesel engine. The fuel filter system in these trucks typically consists of two filters:

  • A rear filter with a water separator
  • A front final filter in the engine bay

It's recommended to change both filters according to your vehicle's maintenance schedule or when the service light indicates.

When to Reset the Fuel Filter Life

Always reset the fuel filter life indicator after replacing your fuel filters. This ensures that your truck's computer accurately tracks the condition of your new filters. Failing to reset can lead to premature warning lights or missed maintenance intervals.

Additional Maintenance Tips

  • Use high-quality fuel filters designed for your specific Ram 3500 model.
  • When changing filters, inspect the housings for any signs of damage or excessive contamination.
  • Regularly drain water from the fuel/water separator to prevent fuel system damage.
  • If you frequently drive in dusty conditions, consider more frequent fuel filter changes.

By following these guidelines and properly resetting your fuel filter life indicator, you'll help ensure optimal performance and reliability from your 2021 Ram 3500 Cummins diesel engine.