When To Change Your Ford F-250 Diesel Fuel Filter

The frequency with which you should change the fuel filter in a Ford F-250 diesel depends on a variety of factors, including the age of the vehicle, the mileage, and the conditions in which it is driven. According to the Ford manual, under special operating conditions, the engine-mounted and frame-mounted fuel filters should be replaced every 15,000 miles (24,000 km), six months, or 600 engine hours. These conditions include frequent towing, extended idling, frequent low-speed operation, sustained high-speed driving at maximum loaded weight, operating in extremely hot or cold temperatures, dusty or sandy conditions, off-road operation, and using biodiesel fuel.

Some Ford F-250 diesel owners opt to change their fuel filters more frequently, such as every other oil change or every 5,000 miles, as a preventative measure to avoid potential issues while on the road. Others choose to inspect the filter at each oil change and only replace it when necessary, as changing the filter too often can be unnecessary and may even be detrimental to the fuel system. Ultimately, it is important to refer to the specific recommendations in the owner's manual for your vehicle, as well as take into account your own driving habits and conditions, to determine the appropriate fuel filter change interval for your Ford F-250 diesel.

Fuel filter replacement parts and tools

The fuel filter in your Ford F-250 Diesel should be replaced at least twice a year or every 10,000 miles, whichever comes first. This will ensure the health of your fuel system and engine, and prevent issues with your injectors.

Parts

When it's time to replace your fuel filter, you will need to purchase a new fuel filter kit. It is recommended to use Motorcraft fuel filters or Racor replacement fuel filters.

Tools

You will also need the following tools:

• 36mm Socket
• 6mm Allen Wrench
• 24mm Sock or ½" Drive Ratchet

Steps

The process of replacing the fuel filter involves the following steps:

• Place a bucket or tub beneath the fuel pump, which is located under the driver's door on the frame rail.
• On the side of the fuel pump, locate and remove the allen plug using the 6mm allen wrench.
• Drain the fuel/water completely into the bucket.
• Using the 36mm socket, remove the large black end cap near the engine. The fuel filter will slide out along with the cap.
• Pull out the old filter and the o-ring from the cap, and dispose of them properly.
• Install the new primary fuel filter into the cap, and then install the supplied o-ring.
• Insert the new filter and cap section into the fuel pump, and tighten the cap securely using the 36mm socket.
• Reinstall the allen plug.
• Repeat the process for the secondary fuel filter, which is located in the engine compartment, sitting between the CAC tube and the air intake tube.
• After replacing both filters, prime the fuel system by turning the ignition to the Run position three times for 30 seconds each.

Where to Buy

You can purchase fuel filter kits and tools from various online retailers, such as Amazon, FordParts.com, and diesel-filters.com, or from your local Ford dealership.

How to replace the primary fuel filter

Step 1: Gather Tools and Materials

Before you begin, ensure you have the necessary tools and materials. These include:

• A fuel filter kit (including a new primary fuel filter)
• A bucket or tub for draining fuel
• A coffee can or leak-proof container for transporting the old filter
• A 36mm socket
• A 6mm Allen wrench
• A 24mm socket or 1/2" drive ratchet
• Oil-resistant gloves
• Rags or paper towels

Step 2: Locate the Primary Fuel Filter

The primary fuel filter is located under the driver's side door, on the frame rail of your Ford F-250 Diesel. Place the bucket or tub for draining fuel beneath the fuel pump.

Step 3: Drain the Fuel

On the side of the fuel pump, locate the Allen plug (a small, brass plug). Using the 6mm Allen wrench, remove the Allen plug. With the bucket in place, completely drain the fuel and water from the system.

Step 4: Remove the Old Primary Fuel Filter

Using the 36mm socket, remove the large black end cap on the end of the fuel pump nearer to the engine. The fuel filter will slide out along with the cap. Pull out the old filter and the O-ring from the cap, and dispose of them properly.

Step 5: Install the New Primary Fuel Filter

Install the new primary fuel filter into the cap. Once seated properly, the new filter will snap into place. Install the supplied O-ring into position on the end cap.

Step 6: Reinsert the New Primary Fuel Filter Assembly

Insert the new filter and cap section into the fuel pump, using the 36mm socket to tighten the cap securely. Be careful not to over-tighten or cross-thread it. Reinstall the Allen plug, being mindful not to strip the thread.

Step 7: Test and Restart

After replacing the primary fuel filter, you must prime the fuel system and bleed out any air. To do this, turn the ignition to the "Run" position three separate times for 30 seconds each. Once complete, you can start the engine and test your new filter.

How to replace the secondary fuel filter

Tools and Supplies:

• 24mm socket or 1/2" square drive ratchet
• Turkey baster
• Fuel filter kit (Motorcraft or Racor replacement fuel filters)
• Bucket or tub
• Coffee can or other leak-proof container
• Oil-resistant gloves
• Rags or paper towels

Step-by-Step Guide:

• Place a bucket or tub under the fuel pump, which is located under the driver's door on the frame rail.
• Remove the secondary fuel filter cap using the 24mm socket or 1/2" square drive ratchet.
• Take out the fuel filter from the housing and remove the O-ring from the lid.
• Use the turkey baster to drain the excess fuel from the housing and dispose of it properly.
• Insert the new secondary filter into the housing.
• Install the new O-ring onto the lid.
• Reinstall the black top cap using the 24mm socket or ratchet to torque the bolt to 124lb. per in. (approximately 10-11lb. per ft.).
• Prime the fuel system by turning the ignition to the "Run" position three times for 30 seconds each.

Notes:

• It is recommended to replace the fuel filters at least twice a year or every 10,000 miles.
• Failing to follow the correct procedure can cause broken or damaged injectors.
• Always dispose of old fuel and filters properly.

How often to change the fuel filter

Changing the fuel filter in your Ford F-250 diesel engine is a vital part of maintenance and can save you money in the long run. The general consensus is to change the fuel filter every 10,000 miles or so, which roughly equates to every other oil change. This interval can vary depending on how often you use your vehicle and the conditions in which you operate it.

For example, if you frequently tow a trailer, idle for extended periods, drive in low-speed or heavy traffic, or operate in dusty or sandy conditions, Ford recommends changing the fuel filter every 15,000 miles, six months, or 600 engine hours. This is also the recommendation if you are using biodiesel or a blend of biodiesel and regular diesel fuel.

Some people opt to change their fuel filter more frequently, such as every 5,000 miles, as a preventative measure to avoid potential issues while on the road. This is especially true for those who don't drive their vehicles often, as moisture can build up in diesel fuel when it sits for extended periods.

On the other hand, changing the fuel filter too frequently can be unnecessary and even detrimental to the filter's performance. The filters need time to reach initial loading and perform at their rated nominal efficiency. Additionally, opening the fuel system more often increases the risk of dirt getting on the clean side of the filter.

Therefore, it is essential to consider your specific usage patterns and operating conditions when deciding how often to change your fuel filter. Regular maintenance and adhering to the manufacturer's recommendations will help ensure the health of your fuel system and engine.

Where to buy fuel filters

Fuel filters for the Ford F-250 diesel can be purchased from a variety of places, including online retailers and physical stores. Here are some options for where to buy fuel filters:

Online Retailers

• FordParts.com: This is the official Ford website for purchasing parts, and they offer a wide range of fuel filters for the F-250 diesel. You can select a dealer based on your location and purchase directly from them.
• EBay Motors: eBay offers a large selection of fuel filters for the F-250 diesel, including both new and used options. You can find various brands, such as Motorcraft, ACDelco, and Wix.
• Amazon: Amazon Prime members can take advantage of free shipping on eligible fuel filter purchases, making it a convenient option.
• Diesel-filters.com: This website offers fuel filters at competitive prices, and shipping is usually reasonable.

Physical Stores

• O'Reilly Auto Parts: O'Reilly is a popular auto parts store that carries fuel filters for the F-250 diesel. You can check their website or visit a local store to find the specific filter you need.
• AutoZone: AutoZone is another well-known auto parts retailer that stocks fuel filters for the F-250 diesel. You can use their website to check availability at your nearest store.
• Dealerships: Your local Ford dealership can be a great resource for purchasing fuel filters. They will have access to OEM (Original Equipment Manufacturer) parts, ensuring a perfect fit and quality.
• Independent Repair Shops: Local repair shops may also be a good option, as they often sell parts directly to customers. It's worth calling around to compare prices and availability.

Frequently asked questions