Ameer Randolph
Replacing the fuel injectors on a 99 Mustang is a straightforward process that can be completed in a few hours. The first step is to relieve the fuel system pressure and disconnect the negative battery cable. Next, remove the front strut tower brace and disconnect the fuel supply line spring lock coupling from the fuel rail. Disconnect the electrical connectors from the fuel injectors and remove the fuel rail mounting bolts. Remove the fuel rails and injectors as a single assembly, and separate the injectors from the fuel rails. Coat the new injector O-rings with clean engine oil and install them into the fuel rails. Reinstall the fuel rails and injectors, and reconnect the electrical connectors and fuel supply line. Reinstall the strut tower brace and reconnect the negative battery cable. Finally, flash the PCM with a new tune and start the engine to check for any fuel leaks.
| Characteristics | Values |
|---|---|
| Vehicle | 1999 Mustang |
| Fuel Injector | 47 lb EV6 High Flow Fuel Injector |
| Installation Time | 1.5 hours |
| Safety Precautions | No smoking, open flames, or light bulbs near the work area. No gas-type appliances in the garage. Wear safety glasses. |
| First Step | Turn off the vehicle and engage the emergency brake. |
| Final Steps | Flash the PCM with a new tune. Check for leaks before and after starting the engine. |
| Tools Required | 13mm standard socket, short ratchet extension, 5/8 spring lock coupling tool, fuel line removal tools |
| Parts Required | Fuel injectors, injector o-rings, engine oil |
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What You'll Learn
Disconnect the battery ground cable and secure it out of the way
Disconnecting the battery ground cable is one of the first steps to take when replacing the fuel injectors on a 99 Mustang. This is because it is important to disconnect the battery when performing any work on the fuel system.
To do this, first, locate the battery in the engine. You will then need to identify the ground cable, which is attached to the negative terminal of the battery. Using an 8mm socket, disconnect the cable from the battery. Be sure to set the socket to the appropriate size for the bolt on the negative terminal. Once the cable is disconnected, move it away from the battery and secure it in a safe place, where it cannot come into contact with any metal parts of the car. This will prevent any accidental electrical shorts while you are working on the fuel injectors.
It is important to note that you should only disconnect the ground cable and not the positive cable. Disconnecting the positive cable could result in a loss of codes in the car's computer, which could affect the functioning of various systems in the vehicle.
Additionally, always exercise caution when working with batteries, as they contain sulfuric acid, which can cause burns and damage if it comes into contact with your skin or eyes. Always wear protective gear, such as gloves and eye protection, when handling batteries.
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Remove the fuel cap
To remove the fuel cap from your 1999 Mustang, follow these steps:
First, locate the fuel cap on your Mustang. It is usually found on the rear side of the vehicle, near the fuel tank.
Next, you will need to unscrew or unlock the fuel cap. If your Mustang has a locking fuel cap, you will need to insert the key into the lock and turn it counterclockwise to unlock it. If it does not have a locking mechanism, simply grip the cap and turn it counterclockwise until it comes loose. You may need to apply some force to break the seal and unscrew it completely.
Once the fuel cap is removed, place it in a safe location where it won't be knocked over or damaged. You may also want to wipe down the cap and the surrounding area if there is any built-up dirt or grease. This will help ensure that the cap seals properly when you replace it later on.
Now that the fuel cap has been successfully removed, you can proceed with the next steps in replacing the fuel injector, such as relieving the fuel system pressure and disconnecting the battery ground cable. Remember to refer to a qualified mechanic or a detailed repair guide for the full procedure, as replacing a fuel injector can be a complex task.
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Release pressure from the fuel system
To relieve the pressure from the fuel system of a 99 Mustang, you must first make sure the vehicle is turned off and the handbrake is on. For automatic vehicles, the transmission should be in park.
Next, disconnect the fuel pump driver module, which is located in the trunk to the left of the spare tire. Then, start the car and let it idle until it stalls. Crank the engine for a few seconds to ensure all fuel pressure in the fuel rail is released. Turn the ignition switch off.
You can also relieve the pressure at the Schrader valve. Cover the Schrader valve with a rag and slowly push the valve in with your fingernail or a screwdriver.
Another method is to disconnect the fuel supply line. First, wrap a towel around the fuel supply line to absorb any residual gasoline. Then, use the proper fuel line disconnect tools to disconnect the fuel supply tube spring lock coupling. There will be pressure on the system, so caution must be taken when removing this line, as fuel can spray out.
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Disconnect the fuel supply line
Disconnecting the fuel supply line is a crucial step in replacing the fuel injectors in a 99 Mustang. Here is a detailed guide on how to do this:
Before you begin, ensure you have the necessary tools, including fuel line removal tools and a 5/8 spring-lock coupling tool. It is also important to work in a well-ventilated area and take appropriate safety precautions when handling fuel lines, as fuel is highly flammable.
First, relieve the fuel system pressure. Cover the Schrader valve with a rag and use a screwdriver to push the valve in, relieving the fuel line pressure. This step is crucial for safety and to prevent spills. Next, locate the fuel supply line on the driver's side of the engine. Place a towel or rag around the fuel supply line to absorb any residual fuel that may spill. Now, carefully disconnect the fuel supply line spring-lock coupling from the fuel rail. First, remove the retaining clip, which should be visible, and then use the 5/8 spring-lock coupling tool to detach the fuel supply line. Be cautious, as there will still be pressure in the system, and fuel may spray out.
At this point, you will need to disconnect the fuel return line as well. This step ensures that the fuel system is completely isolated. Use the appropriate fuel line removal tools to disconnect the fuel return line, following similar steps as for the fuel supply line. It is important to have several rags or towels on hand to absorb any residual fuel that may spill during this process. Once both the fuel supply and return lines are disconnected, you can move on to the next step of removing the fuel injectors.
If you are reinstalling new injectors, remember to lubricate the injector O-rings with clean engine oil or a similar lubricant. This will ensure a proper seal and make it easier to reinstall the fuel rail. Always refer to a qualified mechanic or a detailed guide for the complete process of replacing fuel injectors in a 99 Mustang, as there are many important steps and precautions to consider.
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Remove the fuel rail retaining bolts
To remove the fuel rail retaining bolts, you will need a short ratchet extension and an 8mm deep socket.
First, detach the wiring harness retainer clips from the fuel rails. There are several, so just pull up to remove them.
Next, locate the four fuel rail retaining bolts. These are located under the retainer clips that were previously removed. Use the short ratchet extension and 8mm deep socket to remove these bolts.
Once the bolts are removed, you can then lift the fuel rail and remove the fuel injectors. It is important to have some rags ready to absorb any residual fuel that may leak from the injectors and fuel rails.
If you are replacing the fuel injectors, it is recommended to coat the O-rings on each new injector with a small amount of clean engine oil before installing them into the fuel rail.
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Frequently asked questions
First, disconnect the negative battery cable. Then, relieve the fuel system pressure. You can do this by disconnecting the fuel pump driver module, which is located in the trunk to the left of the spare tire. Next, start the car and let it idle until it stalls. Crank the engine for a few seconds to make sure all fuel pressure in the fuel rail is released. Then, turn the ignition switch off.
Disconnect the fuel supply line spring-lock coupling from the fuel rail on the driver's side of the engine. Make sure you have rags on hand to absorb residual gasoline that spills out of the fuel supply line and fuel rail.
Remove the fuel rail mounting bolts. Then, remove the fuel rails and injectors as a single assembly. Make sure to have rags ready to absorb the residual fuel that runs out of the injectors and fuel rails.
