Replacing The Fuel Pump In Your 99 Super Duty

If you're looking to replace the fuel pump on your 99 Superduty, you've come to the right place. This is a moderately complicated job that can be done at your dealership's service department, but with the right tools and know-how, it can be done at home. The fuel pump is located inside your fuel tank and can fail for a number of reasons, including simple wear and tear, electrical problems, or dirt and rust clogging the pump. Before getting started, it's important to drain the fuel tank if possible, as it will be heavy and difficult to work with when full. Once the tank is empty, you will need to remove it from the vehicle, either by lowering it to the floor or lifting the bed of the truck. With the tank accessible, the next step is to remove the fuel pump. This is done by unscrewing the ring at the top of the pump and sliding it out of the tank. Be sure to have a rag handy to catch any fuel that may spill during this process. Finally, install the new fuel pump and reassemble the vehicle, being sure to properly dispose of the old pump and any fuel.

Removing the fuel tank

To remove the fuel tank on a 1999 F250 Super Duty, you will need to raise the bed off of the frame by at least 12 inches to get enough room to replace the fuel pump. This can be done by using a floor jack and a 2x8 piece of wood. It is also recommended to use a penetrating oil/spray such as PB Blaster on the threads where they come through the frame, and to heat the nuts with a torch to remove them.

Once the bed is raised, you will need to disconnect the fuel lines and wiring connector from the top of the tank. There is a ring on the top of the tank that needs to be unscrewed, and this may require a specialised tool such as a T-50 Torx socket. Be careful not to cross-thread the ring when starting the threads. With the ring removed, the pump assembly can be released by squeezing two clips and pulling it up and out of the tank.

Alternatively, it is possible to drop the tank to the floor and then remove the pump. However, this method may make it difficult to access the top hoses and fuel lines. If you decide to drop the tank, it is important to ensure that the tank is empty, as a full tank will be very heavy and difficult to manoeuvre.

In either case, it is important to take appropriate safety precautions when working with fuel and to ensure that the work area is well-ventilated.

Disconnecting the fuel lines

Firstly, it is important to relieve the pressure in the fuel lines before disconnecting them. This can be done by depressing the pintle inside the fuel pressure test port, which is located on the fuel injector rail on the engine. Make sure to have a rag around the port to keep things clean.

Now, to access the fuel lines, you will need to remove the bed of your truck or drop the fuel tank. Some people find it easier to remove the bed, as it provides clearer access to the tank and its connections. If you choose to remove the bed, you will need to raise it by at least 12 inches to have enough room to work. Use a floor jack and a piece of wood, such as a 2x8, to safely raise the bed.

If you decide to drop the tank, you will need to use a floor jack and possibly a trans jack to lower it. Before dropping the tank, it is recommended to drain the fuel or run the tank empty to make it lighter and easier to handle.

Once you have accessed the fuel lines, you can proceed to disconnect them. A special fuel line disconnect tool is required for this step, which can be purchased at most auto parts stores. With the tool, carefully detach the fuel lines from the top of the tank.

It is important to work carefully and avoid any damage to the fuel lines, as this could create leaks. Make sure to have a suitable container or drain machine ready to catch any fuel that may spill during the disconnection process.

Additionally, take note of how the fuel lines are routed and connected to facilitate proper reconnection during the installation of the new fuel pump.

By following these steps, you will be able to successfully and safely disconnect the fuel lines on your 99 Superduty, allowing you to proceed with the fuel pump replacement.

Accessing the pump

Accessing the fuel pump on your 1999 Super Duty can be done in one of two ways: by dropping the fuel tank or by lifting the bed.

Dropping the Fuel Tank:

• If your Super Duty has a 28-gallon tank, you may have enough room to drop the tank a few inches, disconnect the fuel lines, and remove the wiring connector.
• For larger tanks, you will need to use a floor jack and a 2x8 to support the tank while you work.
• It is recommended to drain the fuel tank or run it as empty as possible before attempting to remove it.
• Once the tank is lowered, you will need to undo the ring at the top of the pump to slide the pump out.

Lifting the Bed:

• This method involves raising the bed off the frame by at least 12 inches to access the fuel pump.
• When unscrewing the ring on the top of the tank, the plate may come off with the fuel lines still connected to the pump assembly.
• There are two clips that release the pump assembly so you can pull it up and out of the tank.
• This method may be preferred if you do not have the space or equipment to safely lower the fuel tank.

Regardless of the method chosen, accessing the fuel pump on a 1999 Super Duty will require some time and effort. It is recommended to have a basic understanding of automotive repair and access to the necessary tools before attempting this job.

Using a fuel line disconnect tool

Firstly, ensure you have the correct size of the tool for your vehicle's fuel line. Place the tool around the connection of the fuel line. Slide the tool in until you hear a click or feel a snap. This indicates that the tool has engaged with the snap ring inside the collar on the line. Then, pull the fuel lines apart.

Some additional tips for using a fuel line disconnect tool include:

• Using compressed air to blow out the fittings and remove any embedded dirt.
• Spraying a light lubricant, such as WD-40, into the fitting to aid in the process.
• Twisting the fuel line to free up the O-rings before attempting to pull it apart.
• Pushing the fitting towards the tool while using a twisting motion before attempting to separate the lines.

It is important to note that not having the correct tool can lead to damage and costly repairs. It is always recommended to use the appropriate tool and follow the necessary safety precautions when working on any vehicle.

Releasing the pump assembly

To release the pump assembly, you will need to access the fuel tank. This can be done by either removing the bed of the truck or dropping the tank. If you decide to remove the bed, you will need to raise it at least 12 inches to get enough room to work. You may also need to use a penetrating oil/spray such as PB Blaster to help loosen the threads where they come through the frame.

Once you have accessed the fuel tank, you will need to undo the ring at the top of the pump. This will allow you to slide the pump out of the tank. There are two clips that need to be released in order to pull the pump assembly up and out of the tank. Be sure to have a fuel line disconnect tool on hand, as you will need this small special tool for removing the lines from the top of the tank.

If your fuel tank is full, it will be heavy, and you will need to use a drain machine to draw the gas from the tank before attempting to remove it. Alternatively, you can try to run the tank empty before beginning the repair.

Frequently asked questions