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Ford F-250: How to Replace Fuel Filter

A bad fuel filter on the Ford Super Duty can lead to poor fuel economy, poor performance, and poor start. Here's how to replace it yourself.

By Cynthia Griffith - November 18, 2014

This article applies to the Ford F-250 and F-350 Super Duty (2005-2014).

A fuel filter is an essential component for every vehicle. It was designed specifically to keep clean fuel funneling through the system, therefore enhancing gas economy and overall performance. What happens if this essential component meant to block debris gets dirty? If the fuel filter in a Ford Super Duty needs replacing, the truck could experience any or all of the following symptoms:

  • Poor fuel economy
  • Slow starts
  • Difficulty idling
  • Difficulty accelerating

If your pickup appears to be displaying any or all of the above mentioned problems, changing the gas filter is an excellent idea. You might even have what it takes to perform this minor maintenance procedure at home. Here are the details.

Materials Needed

  • Turkey baster
  • Complete fuel filter kit
  • 36 mm socket wrench
  • 24 mm socket wrench
  • Large basin
  • Pair of oil resistant gloves
  • Rags or paper towels (whichever are handy)

Step 1 - Drain the fuel

Utilizing the large basin, drain the fuel via the water drain port, which is located under the vehicle on the driver's side.

  • Figure 1. Filter drain port location.
  • Figure 2. Draining the fuel.

Step 2 - Remove the primary fuel filter cap

Using a 36 mm wrench, carefully remove the primary fuel filter cap along with the O-ring, and replace it with the new primary cap from the complete fuel filter kit. The new cap should snap right into place in just a few seconds.

Figure 3. Removing the primary fuel filter.

Step 3 - Repeat Step 2 with the secondary fuel filter cap

The secondary cap can be easily removed with a 24 mm socket wrench. Use the turkey baster to suck the fuel out of the assembly.

Figure 4. Remove the secondary fuel filter located under the hood.

  • Figure 5. Removing the filter cap.

  • Figure 6. Removing the filter.
  • Figure 7. Using turkey baster to drain fuel.
  • Figure 8. Replacing the old filter.

Step 4 - Test and restart

After the secondary fuel filter cap has been replaced, turn the ignition key to the "on" position without starting up the engine, and simply hold that position for about 30 seconds. Once you have waited out that half of a minute or so, feel free to try your new filter out on the road.

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