Replacing The Fuel Pump In Your 1997 Gmc Yukon

Replacing the fuel pump on a 1997 GMC Yukon can be a complex task and it is recommended that, unless you are very experienced in auto repair, you should leave this job to the professionals. However, if you are confident in your abilities, there are a number of steps you can follow to replace the fuel pump yourself.

Firstly, you will need to disconnect the negative battery cable and relieve the fuel system pressure. Then, you will need to drain the fuel tank and remove the fuel tank and sender assembly. Once this is done, you can install a new seal, sending assembly, and lock ring, before reinstalling the fuel tank and reconnecting the negative battery cable. Finally, you will need to check for fuel leaks.

It is important to note that working with the fuel system is dangerous, and you should take all precautions to avoid starting a fire. Always be on the lookout for fuel leaks or odours, and do not start or drive the car if you notice any issues.

Disconnect the negative battery cable

Disconnecting the negative battery cable is the first step in replacing the fuel pump in a 1997 GMC Yukon. This is done to reduce the chance of a fire. Here is a detailed, step-by-step guide on how to do this:

Tools you will need:

• 8-millimeter wrench
• Flat blade screwdriver
• Rags
• Straight-blade screwdriver
• Pliers (optional)
• Pick (optional)
• Transmission jack
• 15-millimeter socket
• 15-millimeter wrench

Procedure:

• Locate the negative terminal on the battery. It is usually marked with a minus (-) sign and black insulation.
• Using the 8-millimeter wrench, loosen the nut that secures the cable to the negative terminal.
• Once the nut is loosened, detach the cable from the terminal and set it aside, ensuring it does not touch any metal parts of the car.
• If there is a cover on the negative terminal, use the 8-millimeter wrench to remove the bolt and take off the cover.
• With the cable disconnected and the terminal exposed, you may now proceed to the next steps in replacing the fuel pump.

It is important to exercise caution when working with a car battery to avoid any accidental short circuits or electrical shocks. Ensure you wear protective gear, including gloves and eye protection. If you are unsure or uncomfortable at any point, it is best to consult a professional mechanic.

Drain the fuel tank

To drain the fuel tank of a 1997 GMC Yukon, you will need to disconnect the negative battery cable. Then, relieve the fuel system pressure. You can refer to the Fuel Pressure Release Procedure for more information on this.

Next, drain the fuel tank. You may need to siphon some fuel out of the tank, so it is recommended to have as little fuel in the tank as possible.

Now, you can remove the fuel tank and sender assembly. You will need to install a new seal, sending assembly, and lock ring. Make sure the lock ring alignment holes fit over the tabs on the tank.

Finally, install a cam lock assembly. Turn the cam lock clockwise to lock it.

Disconnect the fuel feed and vapor hoses

Disconnecting the fuel feed and vapour hoses is a crucial step in replacing the fuel pump of a 1997 GMC Yukon. Here is a detailed, step-by-step guide on how to do this safely and effectively:

Before beginning, ensure you have the necessary tools, including a flat blade screwdriver, a transmission jack, and a 15-millimetre socket or wrench. It is also important to relieve the fuel system pressure and drain the fuel tank to minimise the risk of fuel spray and leaks.

Now, locate the fuel feed and vapour hoses at the back of the fuel tank. To disconnect them, first, squeeze and twist the connector of the fuel feed hose to remove it. Be cautious, as there may be some fuel left in the hose. Next, remove the vapour hose by squeezing and twisting its connector or using pliers if necessary.

If you encounter difficulty removing these hoses, a pick tool can assist in loosening and disconnecting them. Additionally, ensure you have a rag handy to wipe away any fuel spillage and protect your hands.

Once both hoses are disconnected, you can proceed to lower the fuel tank further and continue with the fuel pump replacement process. Remember to work cautiously and refer to a qualified mechanic if you have any doubts or concerns.

Disconnect the electrical connections at the sender

Disconnecting the electrical connections at the sender is a crucial step in replacing the fuel pump of a 1997 GMC Yukon. Here is a detailed, step-by-step guide to help you through the process:

• Disconnect the negative battery cable: Before beginning any work on the fuel pump, it is essential to disconnect the negative battery cable to reduce the risk of fire and ensure your safety.
• Lower the fuel tank: Place a drain pan or container underneath the fuel tank to catch any spilled fuel. Loosen the filler neck hose clamp and disconnect the fuel tank filler neck. Support the fuel tank and remove the tank straps, insulator strips, and lower the tank shield. Now, carefully lower the fuel tank.
• Disconnect the fuel lines and electrical connections: This is the critical step where you will disconnect the electrical connections at the sender. First, disconnect the fuel feed and vapor hoses from the fuel tank. Then, locate the electrical connections at the sender and carefully disconnect them. It is important to be gentle during this step to avoid damaging the electrical connectors or the fuel lines.
• Use appropriate tools: Depending on the specific model of your GMC Yukon, you may need specialized tools to disconnect the electrical connections. Some models may have clips or locks that need to be released before disconnecting the electrical connectors. Make sure to have a rag or towel handy to wipe up any spilled fuel.
• Be cautious with fuel: Always be cautious when working with fuel to avoid any accidental fires or injuries. Ensure proper ventilation and avoid any open flames or sparks during the process. If possible, work in a well-ventilated area and have a fire extinguisher nearby as a safety precaution.
• Take pictures and label wires: Before disconnecting the electrical connections, take pictures of the wiring harness and connectors. This will help you remember the correct locations for reassembly. Label the wires to ensure proper reconnection during the installation of the new fuel pump.
• Check fuel pump wiring: Once the electrical connections are disconnected, you can inspect the fuel pump wiring for any signs of damage or corrosion. If there is visible damage, it may be necessary to replace the wiring harness along with the fuel pump.

By following these steps and exercising caution when working with fuel and electrical systems, you can successfully disconnect the electrical connections at the sender during the fuel pump replacement process for your 1997 GMC Yukon. Remember to refer to your vehicle's repair manual or seek assistance from a qualified mechanic if you encounter any difficulties or uncertainties.

Remove the fuel sender assembly

To remove the fuel sender assembly from your 1997 GMC Yukon, you will need to follow these steps:

Firstly, disconnect the negative battery cable to ensure safety and reduce the risk of fire. Next, relieve the fuel system pressure and drain the fuel tank. Refer to your vehicle's manual for specific instructions on how to perform these tasks. Once the fuel tank is drained, you can proceed to remove the fuel tank and sender assembly.

When removing the fuel tank and sender assembly, you will need to follow these steps:

• Remove the fuel tank off-road shield, if your vehicle is equipped with one.
• Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck.
• Support the fuel tank and remove the tank straps and insulator strips, if equipped. Lower the fuel tank shield.
• Lower the fuel tank.
• Disconnect the fuel feed and vapor hoses.
• Disconnect the electrical connections at the sender.
• Remove the fuel sender assembly and seal ring using the appropriate tool (J 39765). Discard the old seal ring.

Now that you have removed the fuel sender assembly, you can proceed to install the new assembly and fuel pump. Remember to always take proper safety precautions when working on your vehicle and refer to your vehicle's repair manual for detailed instructions specific to your model.

Frequently asked questions