Changing Fuel Filters: 1990 Ford Mustang Guide

Changing the fuel filter on a 1990 Ford Mustang is a simple task that can be completed in less than 15 minutes as part of your regular maintenance schedule. Over time, the fuel filter can become clogged with particles and dirt, reducing horsepower and fuel economy. To change the fuel filter, you will need a new fuel filter, a 5/16th inch spring lock release tool, and a flat-head screwdriver. First, securely raise the rear of the vehicle using ramps or a jack and jack stands. Next, relieve the fuel pressure by disconnecting the fuel inertia switch in the trunk and releasing the Schrader valve located by the throttle body. Then, get under the car and locate the fuel filter, which is right behind the gas tank. Unscrew and remove the clamp, and then pry the fuel filter out of the housing. Use the 5/16th inch release tool to slide the fuel line off the filter, and place a bucket underneath to catch any fuel. Finally, push the new filter into the housing, reattach the clamp, and reconnect the fuel lines, battery, and inertia switch.

Relieve the fuel lines

To relieve the fuel lines of a 1990 Ford Mustang, there are a few methods you can use. One way is to simply let the car sit for 30 minutes to an hour; the pressure will bleed off on its own without the need for any tools or fiddling with the Schrader valve.

Another method is to disconnect the fuel inertia switch, which is located in the trunk. This switch cuts off the fuel supply. Start by finding the Schrader valve, which is located by the throttle body at the end of the fuel rail towards the front of the car. It resembles a tire valve. Once you've located the Schrader valve, unscrew the cap and use a small screwdriver or similar tool to release the fuel pressure. Be sure to wrap a shop rag or towel around the valve to catch any escaping fuel.

After releasing the fuel pressure, start the car and let it idle until there is no more fuel in the lines, causing the car to die. This will minimize the amount of fuel released when changing the filter.

Alternatively, there is a fuel pump shut-off switch mounted in the trunk near the trunk latch. Pop the red button up with a small flat-head screwdriver, then start the car and let it run until it dies. This will release all the pressure from the gas line, resulting in very little fuel spillage when changing the filter.

Once you've relieved the fuel pressure, you can proceed to change the fuel filter.

Disconnect the battery

Disconnecting the battery is an important step when changing the fuel filter on your 1990 Ford Mustang. This is because you are working with fuel lines, and you want to minimise the risk of any sparks that could cause an explosion.

Before you begin, make sure you have the correct tools for the job. You will need a 5/16th-inch spring lock release tool and a flat-head screwdriver. You will also need to raise the rear of the vehicle, so you will need a jack and jack stands, or you can back up on ramps.

Once you have safely raised the rear of the vehicle, locate the battery and disconnect it. You may want to refer to your owner's manual to locate the battery and any specific instructions for your model. It is also good practice to wear safety glasses when working on fuel lines, as there may be some fuel spillage.

Now that the battery is disconnected, you can continue with the next steps to change the fuel filter. Remember to exercise caution when working with fuel, and ensure there are no ignition sources or open flames nearby.

After locating the fuel filter, you will need to use the spring lock release tool to release the fuel lines. Insert the tool onto the fuel line and slide it towards the outside, away from the fuel filter. You will feel resistance, and then a click when the spring releases. Once the tool clicks into place, carefully pull the fuel line away from the fuel filter, allowing any fuel to drain into a bucket or suitable container.

Now that the fuel lines are disconnected, you can proceed to remove the old fuel filter and install the new one, ensuring you follow the correct installation procedure. Finally, reconnect the battery and check for any leaks before starting your Mustang.

Remove the plastic retaining clips

To remove the plastic retaining clips from the fuel filter of a 1990 Ford Mustang, you will need to place a drain under the filter. This is because removing the clips will cause the fuel lines to slide off, and you will want to catch any fuel that escapes in the drain.

Once the drain is in place, remove the plastic retaining clips securing both lines. You can then slide the lines off.

It is likely that these plastic clips will break during this process due to their age. You can buy replacement clips online or from auto part stores. It is recommended to use only the best-quality parts for your Mustang, such as a Genuine Motorcraft Fuel Filter.

Loosen the retaining clamp

To loosen the retaining clamp on your 1990 Ford Mustang, you will need a 5/16th inch spring lock release tool. This is a specialised tool that you can purchase at any auto parts store.

First, make sure you have securely raised the rear of the vehicle, either by backing up on ramps or using a jack and jack stands. The fuel filter is located almost directly above the differential.

Next, find the retaining clamp. This is located on the fuel filter line. Slide the release tool along the fuel filter line until it contacts the spring in the housing and pushes it out of the way. You will feel resistance when the tool meets the spring, and then a click when the spring releases. Once the tool clicks into place, you can pull the fuel line away from the fuel filter.

Place a bucket or drain pan underneath the filter to catch any fuel that may leak out. Now that the retaining clamp has been loosened, you can remove the fuel filter by pulling it out of its bracket.

Install the new filter

To install the new filter, first, check the ends of the fuel filter to ensure they are round and smooth. Then, push the tank side line onto the filter, ensuring that the arrow on the filter is pointing to the engine side of the fuel line.

Next, push the filter into the bracket and slide the radiator clamp on. After that, push the other fuel line onto the filter. You should feel it click past the spring lock.

Finally, secure the radiator clamp and install the safety locks. The safety locks should tilt into and onto the fuel filter line, and then be pushed down and over the larger housing on the fuel line side. The larger lock goes on the outside on the housing.

Frequently asked questions