Katerina Swanson
Replacing the fuel filter on a 99 Mustang is a straightforward task that can be completed in under 15 minutes. The fuel filter is designed to prevent dirt from entering the engine, but over time it can become clogged, which will affect the performance of your Mustang. To replace the fuel filter, you will need to relieve the fuel pressure, remove the fuel line, and install a new filter. This can be done using a quick disconnect tool, which can be purchased for around $6. It is important to wear gloves and eye protection when completing this task, as gasoline vapour is extremely flammable.
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What You'll Learn
Relieve fuel pressure
To relieve fuel pressure from a 99 Mustang, you can try the following methods:
Using the Schrader Valve
Locate the Schrader valve behind the alternator, remove its cap, and use a small flat-head screwdriver to press on it and relieve the pressure.
Using the Inertia Safety Switch
The inertia safety switch is located in the trunk on the driver's side. You can disconnect it and start the engine, letting it run until it dies. This will minimize fuel spray when you remove the fuel lines. Remember to reconnect the switch before starting the engine after replacing the filter.
Using the Fuel Cut-Off Switch
Unplug the electrical connector from the fuel cut-off switch, located in the trunk on the driver's side behind the side panel or brake light. Then, start the vehicle and let it run until it dies.
Using the Fuel Pump Fuse
Pull the fuel pump fuse and start the engine, letting it run until it dies.
Using a Small Nail or Similar Object
If you don't have a fuel pressure tester, you can poke a small nail or similar object into the Schrader valve to let the fuel spray out, similar to releasing air from a tire.
Letting the Car Sit
Let the car sit for a few hours to relieve fuel pressure.
Always exercise caution when working with fuel systems, and ensure there are no open flames or ignition sources nearby.
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Remove plastic retaining clips
To remove the plastic retaining clips from your 99 Mustang's fuel filter, you will first need to relieve the fuel pressure. Do this by unplugging the electrical connector from the fuel cut-off switch, which is located in the trunk on the driver's side. Then, start the vehicle and let it run until it dies.
Next, locate the fuel filter. It is in front of the gas tank. Now, carefully remove the plastic retaining clips at the line ends. Note how they are installed so that you can reinstall them in the correct direction. You can do this by hand. They can simply hang there once they are disconnected.
Once you have removed the plastic retaining clips, you can move on to removing the retainer bracket/clamp and filter.
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Disconnect fuel lines
Disconnecting the fuel lines on a 99 Mustang is a relatively straightforward process, but it requires careful preparation and execution to ensure safety and avoid spills. Here is a detailed guide on how to do it:
Prepare the Vehicle:
Firstly, ensure the vehicle has been sitting for a few hours to relieve fuel pressure. This is crucial for safety and to minimize spills. Locate the Schrader valve behind the alternator, remove its cap, and use a small flat-head screwdriver to release any remaining pressure. Alternatively, you can disconnect the inertia safety switch in the trunk and start the engine, letting it run until it dies. This will also relieve pressure and reduce fuel spray when removing the lines.
Safety Precautions:
Before proceeding, wear gloves and eye protection. Gasoline vapor is highly flammable, so ensure there are no open flames, cigarettes, or any potential ignition sources nearby. Have a rag or a drain pan handy to soak up any gasoline that may drip out.
Disconnecting Fuel Lines:
Locate the plastic retaining clips securing the fuel lines to the filter. Remove these clips by pulling them off by hand. The lines should be able to dangle from the fuel line with the help of a small plastic security line. Once both sides are disconnected, you can loosen the hose clamp securing the filter to the car.
Final Steps:
At this point, you can carefully pull the filter and line apart, using a fuel line disconnect tool if necessary. Gasoline will likely start dripping out, so be prepared to catch it with your rag or drain pan. Once the filter is removed, you can clean up any spilled gasoline and proceed with installing the new filter.
It is important to note that this guide provides general instructions, and specific steps may vary depending on the exact model and configuration of your 99 Mustang. Always refer to the vehicle's service manual or seek advice from a qualified mechanic if you are unsure about any part of the process.
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Remove retainer bracket/clamp
To remove the retainer bracket/clamp, you must first relieve the fuel pressure. This can be done by unplugging the electrical connector from the fuel cut-off switch, which is located in the trunk on the driver's side. Then, start the vehicle and let it run until it dies.
Next, you will need to access the retainer bracket/clamp. The fuel filter is located on the rear of the vehicle, on top of the fuel tank. To do this, you will need to raise the rear of the vehicle. Place a jack in front of the differential and slowly raise the rear axle. Once the vehicle is at the desired height, place two jack stands on the rear axle and lower the car onto them to secure it.
Now that you have accessed the fuel filter, you can begin removing the retainer bracket/clamp. First, remove the two plastic end covers that are secured to the ends of the fuel line connections. Simply pull them off by hand, and they can hang there once disconnected.
After removing the plastic end covers, you can loosen the hose clamp securing the filter to the car. Once the hose clamp is loosened, you can move on to removing the fuel lines.
Before removing the fuel lines, it is important to wear gloves and eye protection, and have a rag handy to soak up any gasoline that may drip out. Gasoline vapor is extremely flammable, so ensure that there are no open flames or cigarettes nearby.
To remove the fuel lines, use a quick disconnect tool. Clip the tool onto the fitting and push it in away from the connector. You will feel it close around the line when it is the right size. Push the tool firmly into the connector to release the clips, and then pull the filter and line apart. Gas will start to come out, so be prepared to catch it with your rag.
With the fuel lines disconnected, you can now remove the retainer bracket/clamp. Simply loosen the clamp and slide the filter out of the bracket.
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Install new filter
To install a new fuel filter in your 99 Mustang, you will need a fuel line disconnect tool or a small screwdriver. You should also wear gloves and eye protection, and have a rag handy to soak up any gasoline.
First, place the new filter in the bracket in the same direction as the old one. Then, connect the two lines on both ends. Simply align them in place and snap them in. Put the two clips back in place, then lower the car.
Before starting the engine, reconnect the inertia safety switch in the trunk. Then, test out the new filter.
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Frequently asked questions
You can relieve the fuel pressure by unplugging the electrical connector from the fuel cut-off switch located in the trunk on the driver's side. Then start the vehicle and let it run until it dies. Alternatively, you can relieve the pressure by disconnecting the inertia safety switch in the trunk and starting the engine.
You will need a fuel line disconnect tool, gloves, eye protection, and a rag to soak up the gasoline.
First, relieve the fuel pressure. Then, remove the two plastic end covers, undo the screw securing the filter, and remove the fuel line from both sides with the quick disconnect tool. Remove the plastic retaining clips securing both lines and slide the lines off. Finally, loosen the hose clamp securing the filter to the car.
