Changing Fuel Filter In Your Subaru Wrx: Step-By-Step Guide

how to change fuel filter subaru wrx

Changing the fuel filter on a Subaru WRX is not a straightforward task and can be expensive. The fuel filter is located in the fuel tank, and while it is possible to change it yourself, some owners have reported that mechanics lack the precision required to replace the fuel filter. To change the filter, you must first remove the rear seat cushion to access the fuel pump assembly. Then, carefully remove the bottom of the canister, disconnect the electrical connection for the fuel level float, and slide the canister apart. With access to the fuel pump, you can then replace the fuel filter.

Characteristics Values
Difficulty Difficult to find as it is part of the whole fuel pump assembly
Location Under the rear seat cushion
Replacement Recommended at 70,000-72,000 miles
Cost Over $500 for the whole assembly
Safety Work outside with proper ventilation

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The fuel filter is located in the fuel tank

The fuel filter is located inside the fuel tank of a Subaru WRX. This is unlike previous models, which had an external fuel filter.

To access the fuel filter, you will need to remove the rear seat cushion. There are pull tabs on each side of the cushion, which you pull towards the front of the vehicle. Once the sides are released, you can remove the cushion by pulling it upwards from the front center. Underneath the cushion, you will see a metal panel. This is the area where the fuel pump assembly is located.

To access the fuel filter, you will need to remove the bottom of the canister. There are four tabs around the canister that hold it together. Carefully pry these tabs up and slide the canister section down. As the canister slides down, disconnect the electrical connection for the fuel level float. With all the tabs and electrical connections disconnected, the two parts should slide apart. Set aside the bottom of the canister, as you no longer need it.

Now, you will have access to the fuel pump and filter. The filter is located behind the pump.

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It's an expensive and difficult process

Changing the fuel filter on a Subaru WRX is a process that requires careful consideration and planning. While it is not a routine maintenance item, replacing the fuel filter can become necessary under certain circumstances. The process can be challenging and costly, and it is important to understand the factors involved before attempting it.

Firstly, the fuel filter on a Subaru WRX is not easily accessible. It is located inside the fuel tank or as part of the fuel pump assembly, which means gaining access to it can be a complex task. The process may involve removing the rear seat cushion, prying open the canister, and disconnecting electrical connections. This complexity adds to the overall difficulty and expense of the process.

Secondly, the cost of replacing the fuel filter can be significant. While the fuel filter itself may not be expensive, the labour involved in accessing and replacing it can drive up the overall cost. The average cost nationwide to change a vehicle's fuel filter, including parts and labour, is between $90 and $207. However, in some cases, the cost of the parts alone can exceed $500, especially if the entire fuel pump assembly needs to be replaced.

Additionally, there is a risk of inaccurate fuel level readings if the replacement is not conducted carefully. Ruining the fuel gauge can lead to incorrect fuel level indications, causing potential issues for the vehicle owner. This precision required in the replacement process further contributes to the overall difficulty and expense.

Furthermore, replacing the fuel filter should be done with proper ventilation when working with gasoline. Performing the replacement during winter or in an enclosed space can be unsafe. These safety considerations add to the complexity and potential cost of the process, as specialized equipment or professional assistance may be required.

In conclusion, changing the fuel filter on a Subaru WRX can indeed be an expensive and difficult process. While it may not be a frequent requirement, certain circumstances, such as a clogged fuel filter or fuel pump issues, may necessitate its replacement. The accessibility, cost of parts and labour, precision required, and safety considerations all contribute to the overall challenge and expense of the procedure. Therefore, it is essential to carefully assess the situation and seek professional advice or assistance if needed.

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You don't need to change it unless there's an issue

You don't need to change your fuel filter unless there's an issue. Many car companies recommend changing the fuel filter every 5 years/50,000 miles, but this is largely dependent on where you live, your driving habits, and other factors.

Subaru owners have reported that their dealerships advised against changing the fuel filter until the fuel pump needs to be replaced, as it is located inside the fuel tank and is expensive and difficult to replace. One owner reported that their dealership did not recommend changing the fuel filter at the 60,000-mile service interval unless there were issues indicating a problem.

Another owner shared that they were advised by a Subaru mechanic not to replace the fuel filter, as it could lead to issues such as a gasoline-smelling cabin and inaccurate fuel level readings. This owner also noted that most mechanics lack the precision required for this task.

However, some owners have experienced problems due to not replacing their fuel filters. One owner reported that their friend, who owned a Mazda, had several expensive issues, including problems with the injectors, due to driving 200k miles without changing the fuel filter. Another owner shared that they were told by a Subaru mechanic that not replacing the fuel filter could damage the injectors.

Symptoms of a clogged fuel filter include problems with starting, stalling, excessive vibration while driving, and rough slow-speed cruising.

If you decide to replace the fuel filter on your Subaru WRX, it is important to note that this process can be challenging. The fuel filter is part of the fuel pump assembly, and accessing it requires removing the rear seat cushion and prying up the tabs around the canister. It is recommended that this job be done outside with proper ventilation.

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It's located behind the fuel pump

To change the fuel filter on a Subaru WRX, you must first locate the fuel pump assembly, which is usually located under the rear seat cushion. To access the assembly, pull the tabs on each side of the cushion towards the front of the vehicle, and then remove the cushion by pulling it upwards.

Now, you will see the metal panel underneath, with the fuel pump assembly located on the passenger side. To access the fuel filter, you need to remove the bottom of the canister. There are four tabs around the canister that hold it together. Pry these tabs up carefully and slide the canister section down. As the canister slides down, disconnect the electrical connection for the fuel level float.

With the canister's bottom removed, you will have access to the fuel pump and the fuel filter. The fuel filter is located behind the pump. You can now replace the filter, following the manufacturer's instructions. Ensure you have the correct filter for your model, as some Subaru models have the fuel filter integrated into the fuel pump assembly.

Once you have replaced the filter, reconnect all the electrical connections and secure the canister bottom. Prime the fuel pump by turning the key without starting the car, and then check for any fuel leaks. If there are no leaks, start the car and recheck for any issues while the vehicle is idling.

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It's a delicate process that can cause inaccurate fuel readings if done incorrectly

Changing the fuel filter on a Subaru WRX is a delicate process that can cause inaccurate fuel readings if done incorrectly. This is because the fuel filter is located within the fuel pump assembly, which includes the fuel level sensor.

To access the fuel pump assembly, you must remove the rear seat cushion. This is done by pulling upwards on the tabs located on each side of the cushion, and then giving the front centre of the cushion a yank to remove it. Underneath, you will find the metal panel that covers the fuel pump assembly. This is where you need to be careful, as the plastic float that reads your fuel level is part of the sending unit, and if damaged, can cause inaccurate fuel readings.

With the rear seat cushion removed, you will now need to remove the bottom of the canister to access the fuel pump and filter. There are four tabs around the canister that hold it together. Carefully pry these tabs up and slide the canister section down. As the canister slides down, disconnect the electrical connection for the fuel level float. With all the tabs and electrical connections disconnected, the two parts should slide apart, and you can set the bottom aside.

Now, with access to the fuel pump and filter, you will need to replace the old filter with a new one. This process should be done outside with proper ventilation to avoid inhaling gasoline fumes. The fuel pump is held in place by two clips on the top, which can be removed to access the filter. Replace the old filter with the new one, ensuring that it is securely connected. Once the new filter is in place, reassemble the canister and electrical connections, and re-install the rear seat cushion.

By following these steps carefully, you can replace the fuel filter on a Subaru WRX while avoiding inaccurate fuel readings. However, it is important to note that this process may vary slightly depending on the model year of your Subaru WRX. Additionally, some people have reported that their mechanics lacked the precision required to replace the fuel filter, so it may be worth considering taking your car to a specialised mechanic.

Frequently asked questions

The service manual advises changing the fuel filter at around 70,000 miles. However, some Subaru owners have claimed to have gone over 250,000 miles without any issues.

Some sources recommend against changing the fuel filter yourself, as it is located in the fuel tank and can be difficult and expensive to replace. It is also a delicate process that can cause inaccurate fuel level readings if not done correctly.

The cost of replacing the fuel filter can be high, with the entire assembly costing upwards of $500. However, it is possible to replace just the filter, which may be more cost-effective.

You can purchase a replacement fuel filter from a Subaru dealership or an authorized dealer.

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