Changing Fuel Filters: Ford F350 Maintenance Guide

Changing the fuel filter on a Ford F350 is an important maintenance task that can help improve fuel efficiency and engine performance. While the process may vary slightly depending on the model year of your F350, here's a general overview of the steps involved:

First, locate the fuel filter. On most F350 models, the fuel filter is located near the driver-side frame rail or under the hood, between the CAC tube and air intake tube. Place a bucket or tub under the fuel filter to catch any spilled fuel during the replacement process.

Next, drain the fuel from the filter. Depending on your model, you may need to remove a plug or loosen a drain valve to allow the fuel to drain. Once the fuel is drained, remove the fuel filter cap or housing using a socket wrench or ratchet of the appropriate size. Be sure to have a catch container nearby to capture any remaining fuel.

Now, you can remove the old fuel filter and O-ring from the cap or housing. Dispose of these components properly and install the new fuel filter and O-ring. Reinstall the cap or housing, ensuring it is tightened securely, but be careful not to over-tighten it.

Finally, reconnect the fuel lines and open the fuel pump shut-off valve. Start the engine and check for any leaks. It's important to let the engine run for a few minutes to allow the new fuel filter to prime itself.

That's a basic overview of the process of changing the fuel filter on a Ford F350. Depending on your specific model, there may be additional steps or variations, so it's always a good idea to refer to a vehicle repair manual or seek advice from a qualified mechanic.

Drain the fuel

To drain the fuel from your Ford F350, you'll need to park your truck on a level surface and engage the parking brake. This is an important safety measure to prevent the vehicle from moving or rolling during the fuel filter replacement process.

Locate the water drain port, which is situated under the vehicle on the driver's side. Place a large basin or container underneath the drain port to catch the fuel. Now, carefully drain the fuel through the water drain port. It is important to be cautious and avoid any spills or messes during this step.

Once the fuel is completely drained, you can move on to the next step of replacing the fuel filter. Remember to properly dispose of the drained fuel in an environmentally friendly manner.

Remove the primary fuel filter cap

To remove the primary fuel filter cap of your Ford F350, follow these steps:

Park your truck on a level surface and engage the parking brake. The primary fuel filter is located under the driver's side door, on the frame rail. Place a tub or bucket beneath the fuel pump to catch any fuel or water that drains out.

On the side of the fuel pump, locate the small, brass allen plug. Using a 6mm allen wrench, remove the allen plug by turning it counter-clockwise. With the bucket in place, completely drain the fuel and water from the fuel pump.

Now, using a 36mm socket, remove the large black end cap, which is nearer to the engine. Note that the fuel filter will slide out along with the cap. Pull the old filter and the o-ring from the cap, and properly dispose of both.

At this point, you can install the new primary fuel filter. Insert the new filter into the cap, and it should snap into place. Install the supplied o-ring into position on the end cap. Then, insert the new filter and cap section into the fuel pump, using the 36mm socket to tighten the cap securely. Torque it to 19lb. per ft.

Finally, being mindful not to over-tighten or cross-thread it, reinstall the allen plug.

Remove the secondary fuel filter cap

To remove the secondary fuel filter cap on a Ford F350, follow these steps:

First, locate the secondary fuel filter. It is usually found in the engine compartment, sitting between the CAC tube and the air intake tube.

Next, identify the two lids on the secondary fuel filter housing. One is for the oil filter, and the other, smaller one, is for the secondary fuel filter. Remove the smaller lid or cap using a 24mm socket wrench.

Once the cap is removed, use a turkey baster to drain the excess fuel from the assembly. Be sure to properly dispose of the drained fuel.

Now, you can remove the secondary fuel filter from the housing. Simply pull it out, being careful not to spill any remaining fuel.

Finally, take out the o-ring from the lid or cap. It's important to replace this o-ring with a new one when you install the new secondary fuel filter.

By following these steps, you will have successfully removed the secondary fuel filter cap on your Ford F350, allowing you to install a new fuel filter. Remember to dispose of the old fuel filter properly and always work in a well-ventilated area when handling fuel.

Test and restart

Once you've replaced the secondary fuel filter cap, it's time to test and restart your Ford F350. Turn the ignition key to the "on" position without starting the engine and hold it there for about 30 seconds. After you've waited half a minute, you can try out your new filter on the road.

It's crucial to let the engine run for a few minutes to allow the new filter to prime itself. This ensures that the fuel system is properly purged of any air bubbles. You may notice a slight hesitation or rough idle during this period, but this is normal as the system adjusts.

If you fail to properly prime the fuel system, it can cause serious damage to the injectors, and that damage might not be immediately detectable. Damaged injectors can run—seemingly as normal—for a short time after the failure has occurred, so it’s not always apparent that there’s something wrong.

Wear safety gear

It is important to wear safety gear when changing the fuel filter on a Ford F350. Safety gear is essential to protect yourself from injury and to ensure that you are following proper safety protocols when working on your vehicle. Here are some key points to remember:

• Eye Protection: It is crucial to wear safety glasses or goggles to protect your eyes from any debris, dust, or fuel splatter that may occur during the fuel filter replacement process.
• Gloves: Gloves are essential to protect your hands from fuel, dirt, and other contaminants. Vinyl gloves or mechanic's gloves are recommended to provide a good grip and protection.
• Clothing: Wear long sleeves and pants to protect your skin and body from any spills or splatters. Avoid wearing loose clothing that could get caught in moving parts or hang down, potentially exposing you to fuel or hot engine components.
• Respiratory Protection: Consider wearing a respirator or mask to avoid inhaling fuel vapors or dust. This is especially important if you are working in an enclosed space or if there is limited ventilation.
• Hearing Protection: If you are working in a noisy environment, such as a garage or near busy roads, consider wearing earplugs or earmuffs to protect your hearing.
• Fire Safety: Keep a fire extinguisher nearby in case of any accidents or fuel spills that could potentially ignite. Avoid having any flammable materials or ignition sources, such as lighters or matches, near the work area.
• Footwear: Wear closed-toe shoes or boots to protect your feet from dropped tools or any falling objects. Ensure your footwear is made of non-flammable material.

Remember to wear your safety gear throughout the entire process of changing the fuel filter on your Ford F350. It is also a good idea to have a helper or assistant nearby in case of any emergencies.

Frequently asked questions