Regan Brown
If your 2003 Mustang is leaking fuel, you may need to replace the filler neck. This can be done by raising the vehicle and supporting it on jack stands, removing the left rear wheel and tire, and disconnecting the fuel tank filler pipe hose from the fuel tank. You will also need to disconnect the fuel vapor tube assembly from the fuel tank filler pipe recirculation tube. It is recommended that you wait until the tank is empty before attempting this.
| Characteristics | Values |
|---|---|
| Step 1 | Lift the rear of the car using tall lifting ramps |
| Step 2 | Disconnect the battery |
| Step 3 | Place a floor jack in the middle of the tank |
| Step 4 | Unbolt the small loop attached to the filler neck from the tank |
| Step 5 | Disconnect the wire harnesses plugged together on a plastic clip bracket which is attached to the underneath of the car |
| Step 6 | Remove the fuel tank filler pipe bolt and bracket |
| Step 7 | Loosen the lateral stiffener bar-to-body mount nut and remove the two bolts |
| Step 8 | Position the bar aside |
| Step 9 | Remove the left exhaust intermediate pipe |
| Step 10 | Detach the fuel tank filler pipe from the fuel filler bezel |
| Step 11 | Remove the left rear wheel and tire |
| Step 12 | Remove the left rear wheel splash shield |
| Step 13 | Disconnect the fuel tank filler pipe hose from the fuel tank |
| Step 14 | Disconnect the fuel vapor tube assembly from the fuel tank filler pipe recirculation tube |
| Step 15 | Slide the filler tube out of the tank |
| Step 16 | Remove the old rubber seal out of the tank |
| Step 17 | Lube the new seal and the filler tube with grease |
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What You'll Learn
Disconnect the battery
Disconnecting the battery is the second step in replacing the filler neck fuel in a 2003 Mustang. The first step is to lift the rear of the car using tall lifting ramps. After disconnecting the battery, place a floor jack in the middle of the tank. There is a small loop attached to the filler neck, which should be unbolted from the tank. There are two wire harnesses plugged together on a plastic clip bracket which is attached to the underneath of the car.
To replace the filler neck fuel, the vehicle should be raised and supported on jack stands. The left rear wheel and tire should be removed, as well as the left rear wheel splash shield. The fuel tank filler pipe hose should be disconnected from the fuel tank. The fuel vapor tube assembly should be disconnected from the fuel tank filler pipe recirculation tube. The fuel tank filler pipe bolt and bracket should be removed. The lateral stiffener bar-to-body mount nut should be loosened and the two bolts removed. The bar should be positioned aside. The left exhaust intermediate pipe should be removed and the fuel tank filler pipe detached from the fuel filler bezel.
Once the filler neck fuel has been replaced, the old rubber seal should be taken out of the tank. When putting the new one in, it should be lubricated with grease. Di-electric grease is recommended. The new seal and the filler tube should be well-lubricated.
It is recommended to drop the tank when replacing the filler neck fuel. This can be done with a jack when the tank is empty.
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$39.9
Remove the fuel tank filler pipe bolt and bracket
To remove the fuel tank filler pipe bolt and bracket, you will need to first lift the rear of the car using tall lifting ramps. Disconnect the battery and place a floor jack in the middle of the tank. There is a small loop attached to the filler neck, unbolt the loop from the tank. Loosen the lateral stiffener bar-to-body mount nut and remove the two bolts. Position the bar aside.
The next step is to remove the left exhaust intermediate pipe and detach the fuel tank filler pipe from the fuel filler bezel. You can then slide the filler tube out of the tank. You may have to jerk the tank and tube away from each other to get it out.
It is recommended to drop the tank when replacing the fuel filler neck. Wait until it is empty and do it with a jack.
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Disconnect the fuel tank filler pipe hose from the fuel tank
To disconnect the fuel tank filler pipe hose from the fuel tank, you will first need to raise the vehicle and support it on jack stands. Remove the left rear wheel and tire, as well as the left rear wheel splash shield. You can then disconnect the fuel tank filler pipe hose from the fuel tank.
Before disconnecting the hose, you will need to remove the fuel tank filler pipe bolt and bracket. Loosen the lateral stiffener bar-to-body mount nut and remove the two bolts. Position the bar aside. You will also need to remove the left exhaust intermediate pipe.
You can then disconnect the fuel tank filler pipe hose from the fuel tank. You may need to jerk the tank and tube away from each other to get it out.
It is recommended that you drop the tank before attempting this process. Wait until the tank is empty and use a jack to drop it. This will give you the proper clearance to wiggle the neck out of the tank.
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Disconnect the fuel vapor tube assembly from the fuel tank filler pipe recirculation tube
To disconnect the fuel vapor tube assembly from the fuel tank filler pipe recirculation tube, you will need to raise the rear of the car using tall lifting ramps. Disconnect the battery and place a floor jack in the middle of the tank. You will then need to unbolt the small loop attached to the filler neck from the tank.
There are two wire harnesses plugged together on a plastic clip bracket which is attached to the underneath of the car. Remove the fuel tank filler pipe bolt and bracket. Loosen the lateral stiffener bar-to-body mount nut and remove the two bolts. Position the bar aside.
Remove the left exhaust intermediate pipe and detach the fuel tank filler pipe from the fuel filler bezel. You can then disconnect the fuel vapor tube assembly from the fuel tank filler pipe recirculation tube.
It is recommended to drop the tank when replacing the fuel filler neck. Wait until it is empty and do it with a jack.
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Remove the old rubber seal from the tank and lube the new one with grease
To replace the filler neck fuel on a 2003 Mustang, you'll need to lift the rear of the car using tall lifting ramps, disconnect the battery, and place a floor jack in the middle of the tank. There is a small loop attached to the filler neck, so unbolt this from the tank.
Now, to remove the old rubber seal from the tank, you may need to jerk the tank and tube away from each other to get it out. Once it's out, take the old rubber seal out of the tank.
When you're ready to put the new one in, make sure to lube it with grease. You can use di-electric grease and lube both the new seal and the filler tube.
To finish the job, follow these steps:
- Loosen the lateral stiffener bar-to-body mount nut and remove the two bolts. Position the bar aside.
- Remove the left exhaust intermediate pipe and detach the fuel tank filler pipe from the fuel filler bezel.
- Remove the fuel tank filler pipe bolt and bracket.
- Disconnect the fuel vapor tube assembly from the fuel tank filler pipe recirculation tube.
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Frequently asked questions
First, lift the rear of the car using tall lifting ramps. Disconnect the battery and place a floor jack in the middle of the tank. There is a small loop attached to the filler neck, unbolt the loop from the tank. Remove the fuel tank filler pipe bolt and bracket. Loosen the lateral stiffener bar-to-body mount nut and remove the two bolts. Position the bar aside. Remove the left exhaust intermediate pipe and detach the fuel tank filler pipe from the fuel filler bezel.
You will need tall lifting ramps, a floor jack, a wrench, and grease.
The process should take a few hours, depending on your level of expertise and the tools you have available.
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