Mustang Fuel Filter: When And Why To Replace It

Replacing the fuel filter on a Mustang is a simple task that can be done at home in under an hour. The fuel filter should be replaced every 15,000 to 20,000 miles, or annually, to ensure optimal fuel economy and engine performance. While the process is similar across Mustang models, there are some differences, particularly for the S550 Mustang, which does not have a fuel filter. Instead, the filter is located inside the fuel pump in the gas tank and is not serviceable. For older Mustang models, the fuel filter is typically located under the driver's seat. The process involves removing the fuel pump fuse, disconnecting the negative battery cable, jacking up the car, and replacing the fuel filter. It is important to relieve fuel pressure and take precautions to avoid getting sprayed by fuel.

Fuel filter replacement on Mustang models from 2010 onwards

If you own a Mustang model from 2010 onwards, you may not need to replace the fuel filter. According to some sources, there is no fuel filter on any S550 Mustang models, and the last model year of the Mustang that had a fuel filter was 2010. However, other sources suggest that the fuel filter on Mustang models from 2010 onwards is located inside the fuel tank, and it is recommended to replace it every 15,000 to 50,000 miles.

If your Mustang does have a fuel filter, here are the steps to replace it:

• Relieve the fuel pressure by pulling the fuel pump fuse while the engine is running, then turn off the car.
• Raise the car using a jack or jack stands, if possible.
• Locate the plastic cover for the fuel filter on the driver's side underbody.
• Remove the plastic cover by unscrewing it.
• Get some rags ready to catch any fuel spillage.
• Locate the fuel filter and identify the connectors that attach it to the fuel lines.
• Release the connectors using needle-nose pliers or a special tool, depending on the type of connector.
• Remove the old filter and install the new one, ensuring the connectors snap back into place.
• Lower the car and put the fuse back in.
• Turn the key to "on" for 30 seconds to pressurize the fuel system and check for leaks.
• Install the filter cover.

Please note that working with fuel can be dangerous, and it is essential to take the necessary safety precautions. Always relieve fuel pressure and wear eye protection to avoid fuel spray and splashes.

How to release fuel line pressure before replacing the filter

To release the fuel line pressure in your Mustang before replacing the filter, there are a few methods you can use. Here is a step-by-step guide:

First, it is important to note that you should exercise caution when dealing with fuel lines, as they contain pressurised gas and fuel that can be hazardous. It is recommended to wear protective gear, such as eye protection, and have rags or towels on hand to soak up any spilled fuel.

One method to release the fuel pressure is to use the fuel pressure test port, or Schrader valve, on the fuel rail. This valve is usually located on the passenger side rail towards the front of the engine. Before attempting to release the pressure, it is advised to unplug the fuel pump connector at the reset button, which is typically found on the left wall of the trunk. Additionally, you may want to let the engine cool down to prevent too much fuel from spraying out of the valve.

Another approach is to unplug the harness that connects to the reset switch in the trunk. This will disable the fuel pump. Then, put the key in the ignition and crank the engine for a few seconds. This will release any remaining pressure in the fuel lines without the need to mess with the Schrader valve.

If you are unable to start the car, an alternative method is to remove the fuel pump fuse or relay and then attempt to start the vehicle. Let it crank for a little while to ensure the pressure is released.

Finally, a simple way to release the pressure is to open the fuel filler door and cap, and then wait for at least 30 minutes. This will allow the pressure to dissipate naturally, although some fuel may still drip out when you disconnect the lines.

Once you have released the fuel line pressure using one of the above methods, you can proceed with replacing the fuel filter, ensuring that you are careful when disconnecting the fuel lines to avoid spills.

Where to buy a new fuel filter for a Mustang

If you're looking to buy a new fuel filter for your Mustang, there are a few options to consider. Firstly, it's important to determine the model year of your Mustang as this can impact the type of fuel filter required. For example, according to a forum post, the last model year of the Mustang that had a fuel filter was 2010, with no fuel filter present in any S550 Mustang.

Once you've determined the correct fuel filter for your Mustang's model year, you can explore the following options for purchase:

Online Retailers

You can find fuel filters for various Mustang models on online retailers such as eBay and AutoZone. These websites offer a wide range of options, and you can conveniently purchase the fuel filter you need from the comfort of your home.

Automotive Parts Stores

Another option is to visit automotive parts stores, such as Advance Auto Parts, which offers a selection of fuel filters for the Ford Mustang. They carry trusted brands like Carquest Premium and Motorcraft, ensuring you get a quality product for your vehicle.

Dealerships

Finally, you can always go directly to a Ford dealership and request a replacement OEM filter. This option ensures you get a fuel filter specifically designed for your Mustang, although it may be more expensive than other options.

When making your decision, it's important to consider factors such as convenience, price, and the reputation of the seller or retailer. Additionally, keep in mind that fuel filters are essential for maintaining optimal engine performance, so choosing a quality product is crucial.

How to remove the old fuel filter

To remove the old fuel filter from a Mustang, you'll need to first remove the fuel pump relay and disconnect the battery. This will ensure that the fuel pump doesn't turn on while you're working. Next, crank the engine over a few times to clear any remaining fuel from the lines, then disconnect the negative (black) terminal on your battery.

Now it's time to access the fuel filter. First, remove the fuel line shield—there are usually three 10mm nuts holding it in place. With the shield removed, you'll be able to see the fuel filter and its fuel lines.

Before removing the fuel lines, it's important to take some safety precautions. Put on gloves and eye protection, and have some rags ready to collect any fuel that might spill. Now, to remove the fuel lines, simply push in the green tab and pull the lines away from the filter.

With the fuel lines disconnected, you can now slide the old fuel filter out. Be aware that it can only be removed in one direction, so make sure you're pulling it out correctly.

And that's it! The old fuel filter has been successfully removed and you can now install a new one. Just remember to follow the installation steps in the correct order to ensure a safe and proper fuel filter replacement.

How to install a new fuel filter

When to Replace Your Fuel Filter

Before installing a new fuel filter, it's important to know when to replace it. Fuel filters should be replaced as part of your regular maintenance schedule. Over time, your Mustang's fuel filter can become clogged with particles and dirt, which can reduce horsepower and fuel economy. It is recommended to replace your fuel filter every 15,000 miles, but this may vary depending on the quality of gas used and other factors.

Step-by-Step Guide to Installing a New Fuel Filter

• Place a drain pan under the filter: Before removing the old fuel filter, place a drain pan or container under the filter to catch any spilled fuel. This will help minimize the mess and safely contain the spilled fuel.
• Remove the plastic retaining clips and fuel lines: Using a screwdriver or your hands, carefully remove the plastic retaining clips securing the fuel lines to the filter. Slide the fuel lines off the filter. Be prepared for some fuel to spill out, and have rags or towels ready to absorb it.
• Loosen the retaining clamp: Use a 5/16" nut driver to loosen the retaining clamp that holds the filter in place.
• Slide out the old filter: Once the clamp is loosened, carefully slide the old filter out of the bracket. Be cautious as the filter will still contain fuel.
• Insert the new filter: Take the new fuel filter and slide it into the bracket. Ensure that it is securely seated in the correct position.
• Reattach the fuel lines: Reattach the fuel lines to the new filter. Use the supplied plastic retaining clips to secure the lines to the filter. Make sure the connections are tight to prevent leaks.
• Tighten the retaining clamp: Use the 5/16" nut driver to tighten the retaining clamp that holds the new filter in place.
• Check for leaks: Once the new filter is installed, start the car and let it run for a few minutes. Check the fuel filter and the surrounding area for any signs of leaks. If leaks are detected, tighten the connections and check again.

Additional Tips:

• It is recommended to change the fuel filter when the fuel tank is empty or near empty to minimize the amount of fuel spillage.
• Always exercise caution when working with fuel. Have rags or towels ready to absorb any spilled fuel, and work in a well-ventilated area to avoid inhaling fumes.
• Wear eye protection to shield your eyes from potential fuel splashes.
• Depending on the model year and type of your Mustang, the fuel filter's location and specific installation steps may vary. Always refer to your owner's manual or seek advice from a qualified mechanic if you are unsure.

Frequently asked questions