Replacing The Fuel Pump In A 1994 3000Gt: Step-By-Step Guide

Replacing the fuel pump in a 1994 Mitsubishi 3000GT is a task that can be completed at the side of the road and does not require removing the gas tank. The process involves reducing the fuel-line pressure, removing the fuel pump assembly, draining the fuel, and installing a new pump. The fuel-line fittings can be challenging to loosen, and it is important to wear safety goggles when working underneath the car. The tools required for this task include a Phillips screwdriver, a flat-blade screwdriver, wrenches, sockets, and a ratchet.

Disconnect the hose at the other end

Disconnecting the hose at the other end is a crucial step in replacing the fuel pump in a 1994 3000GT. This step is necessary to access and remove the fuel pump assembly. Here is a detailed guide on how to do it:

First, locate the hose. The hose in question is the high-pressure fuel line, which is attached to the metal pipe coming out of the fuel pump assembly. It is secured by what looks like two nuts or a bolt and a nut. To identify the correct components, it is important to note that the "bolt" is fixed to the metal pipe and does not turn, while the "nut" is attached to the rubber hose and can be loosened.

Before beginning the disconnection process, it is recommended to reduce the fuel line pressure. This can be done by unplugging the electrical connection for the pump, which is located at the rear of the blue, two-way valve. Press down on the top tab and pull it forward. After this, attempt to start the car; it should not start.

Now, to disconnect the hose, follow these steps:

• Attach a 14-mm flare-nut wrench or an open-end wrench to the fixed "bolt" on the metal pipe. This will prevent it from moving or bending during the process.
• Use a 19-mm open-end wrench to loosen the "nut" on the hose. Push or pull the wrench toward the outside (passenger side) of the car to loosen it.
• Once the "nut" is loose, you may be able to completely remove it by twisting the rubber hose multiple times. However, it is typically easier to loosen the fitting at the other end of the hose, which is located in front of and above the gas tank.
• To loosen the fitting at the front of the hose, use the same wrench sizes: 19-mm on the hose "nut" and 14-mm on the metal pipe "bolt". Remember that the bolt rotates counterclockwise and the nut rotates clockwise when you are laying on your back, head towards the front of the car, looking up at the fitting.
• It is not necessary to completely disconnect this fitting; simply loosen it.
• Remember to wear safety goggles when working underneath the car.

By following these steps, you will successfully disconnect the hose at the other end, allowing you to access and remove the fuel pump assembly for replacement.

Use a 14-mm flare-nut wrench on the fixed bolt

To replace the fuel pump in a 1994 3000GT, you will need to remove the high-pressure fuel line. This is located at the end of the metal pipe coming out of the assembly. It looks like there are two nuts there, or a bolt and a nut. The bolt is fixed to the metal pipe and does not turn. The nut is attached to the rubber hose.

To remove the high-pressure fuel line, follow these steps:

• Attach a 14-mm flare-nut wrench to the fixed bolt on the metal pipe. This can be an open-end wrench if you don't have a flare-nut wrench. You will need to use a 14-mm flare-nut wrench on the fixed bolt to loosen it, as it is too tight to turn by hand. Place the wrench on the bolt and hold it in place, ensuring it is secure and won't slip.
• Use a 19-mm open-end wrench to loosen the nut on the hose. Using your other hand, take the 19-mm wrench and place it on the nut attached to the rubber hose. Push or pull the wrench towards the outside (passenger side) of the car to loosen the nut. Be careful not to move or bend the bolt or metal pipe. This may take some force, so be sure to brace yourself and use both hands.
• Loosen the fitting at the other end of the hose. It will be easier to fully remove the nut if you loosen the fitting at the front of the hose, above the gas tank. This is easier if the car is raised. Both pieces spin on the fitting, so you can use the same two wrenches to loosen this part. The bolt rotates counterclockwise and the nut rotates clockwise when you are laying on your back, head towards the front of the car, looking up at the fitting.
• Remove the high-pressure fuel line. Once the nut is loose, you can try to remove it by twisting the rubber hose. If this doesn't work, loosen the other end of the hose as described in step 3. Then, you can simply pull the hose off the pump end.

After completing these steps, you can move on to removing and replacing the fuel pump assembly. Remember to always take the necessary safety precautions when working on your car, especially when working with fuel lines and underneath the car.

Use a 19-mm open-end wrench to loosen the nut on the hose

To replace the fuel pump in a 1994 3000GT, you will need to remove the high-pressure fuel line. This is located at the end of the metal pipe coming out of the assembly. It will look like there are two nuts there, or a bolt and a nut. The "bolt" is fixed to the metal pipe and will not turn. The "nut" is attached to the rubber hose.

To loosen the nut on the hose, you will need to use a 19-mm open-end wrench. Here are some detailed instructions on how to do this:

First, attach a 14-mm flare-nut wrench (or an open-end wrench) to the fixed bolt on the metal pipe. This will help to keep the bolt and metal pipe from moving or bending while you loosen the nut on the hose. You may find it easier to work inside the compartment with a foot on the 14-mm flare-nut wrench for stability and leverage.

Next, use the 19-mm open-end wrench to loosen the nut on the hose. Push or pull the wrench toward the outside (passenger side) of the car to loosen the nut. If you are having trouble, try soaking the fitting with penetrating oil and letting it sit for a few minutes before trying again. You may also need to enlist the help of someone stronger if you are unable to generate enough force.

Once the nut is loose, you can try to remove it completely by twisting the rubber hose many times. However, it is usually easier to loosen the fitting at the other end of the hose, which is located in front of and above the gas tank. To do this, you will need to raise the car, as it will be difficult to access this area from underneath the vehicle. Loosen the fitting using the 19-mm wrench on the hose nut and the 14-mm wrench on the metal pipe bolt. Be sure to wear safety goggles when working underneath the car to protect your eyes from debris.

By following these steps, you should be able to successfully loosen the nut on the hose and remove the high-pressure fuel line, allowing you to access and replace the fuel pump in your 1994 3000GT.

Remove the six 8-mm nuts on the assembly

To remove the six 8-mm nuts on the assembly, you will need an 8-mm socket and a ratchet. These nuts are located on the top of the fuel pump assembly, which you will need to remove to lift out the assembly.

Before you can remove the fuel pump assembly, you will need to reduce the fuel line pressure by unplugging the electrical connection for the pump. You can do this by pressing down on the top tab and pulling it forward. You should then try to start the car—it shouldn't start. Next, remove the blue, two-way valve by sliding the valve up off its mounting post on the top of the fuel pump assembly. Slide the clamp on the back hose off the valve and slide the hose off the valve (twisting can help).

Now you can move on to removing the high-pressure fuel line. This is located at the end of the metal pipe coming out of the assembly and looks like there are two nuts there (or a bolt and a nut). The "bolt" is fixed to the metal pipe and does not turn, while the "nut" is attached to the rubber hose. Attach a 14-mm flare-nut wrench (or an open-end wrench) to the fixed bolt on the metal pipe. Use a 19-mm open-end wrench to loosen the nut on the hose by pushing or pulling the wrench toward the outside (passenger side) of the car. Be careful not to move or bend the bolt or metal pipe.

Once the nut is loose, you can try to remove it completely by twisting the rubber hose. However, it's usually easier to loosen the fitting at the other end of the hose, which is located in front of and above the gas tank. To do this, you'll need to raise the car. Loosen the fitting using the 19-mm wrench on the hose nut and the 14-mm wrench on the metal pipe bolt. The bolt rotates counterclockwise, and the nut rotates clockwise, as you lay on your back, head towards the front of the car, looking up at the fitting. You don't need to disconnect this fitting; just loosen it. Don't forget to wear safety goggles when working underneath the car.

Now you can move on to removing the six 8-mm nuts from the top of the assembly. Remember that these nuts hold the assembly in place, so be sure to remove them carefully. Once they're removed, you can lift out the assembly. Be careful not to tear the rubber gasket that goes between the assembly top and the compartment floor as you remove it. You will need to rotate and tilt the assembly to get it out of the tank.

Drain the fuel from the assembly

To drain the fuel from the assembly of your 1994 3000GT, you will need to remove the fuel pump assembly first. Here is a step-by-step guide:

Preliminaries

• Ensure you have no more than a 1/4 tank of fuel.
• Raise the car using ramps, a lift, or jack stands. This step is optional but will make the task easier.
• Fold down the rear seat backs and clear out the rear storage compartment, including the spare tire and storage bins.
• Remove the carpet and the cardboard cover (there are two Phillips screws in each hinge).
• Remove the access cover to the pump assembly on the right side of the compartment floor (there are four Phillips screws).

Reducing Fuel-Line Pressure

• Unplug the electrical connection for the pump (located at the rear of the blue, two-way valve). Press down on the top tab and pull it forward.
• Try to start the car—it shouldn't start.

Removing the Blue, Two-Way Valve

• Slide the valve up and off its mounting post on the top of the fuel pump assembly.
• Slide the clamp on the back hose off the valve and then slide the hose off the valve (twisting can help).

Removing the High-Pressure Fuel Line

• Locate the end of the metal pipe coming out of the assembly.
• Identify the "bolt" and the "nut" at the end of the metal pipe (the bolt is fixed to the pipe and does not turn, while the nut is attached to the rubber hose).
• Attach a 14-mm flare-nut wrench or an open-end wrench to the fixed bolt on the metal pipe.
• Use a 19-mm open-end wrench to loosen the nut on the hose by pushing or pulling the wrench toward the outside (passenger side) of the car. Be careful not to move or bend the bolt and metal pipe.
• If necessary, loosen the fitting at the other end of the hose (in front of and above the gas tank).

Removing the Fuel Pump Assembly

• Remove the six 8-mm nuts on the top of the assembly.
• Carefully rotate and tilt the assembly to lift it out, being mindful of the rubber gasket along the edge of the assembly top.

Now that the fuel pump assembly has been removed, you can proceed to drain the fuel out of the assembly in an environmentally conscious manner.

Frequently asked questions