Replacing The Fuel Pump In A 2004 Chevy Blazer: Step-By-Step Guide

If you're experiencing problems with your 2004 Chevy Blazer's fuel pump, you may need to replace it. The fuel pump is located inside the fuel tank and delivers an instant flow of fuel to the fuel delivery system. Signs of a faulty fuel pump include a car that won't start, a car that stalls after starting, or a check engine light coming on. While it is possible to replace the fuel pump yourself, it is a moderately complicated job and may be best performed by a professional mechanic or dealership service department. If you decide to replace the fuel pump yourself, here are the general steps you can follow:

- Park your Blazer on level ground and relieve the fuel system pressure.

- Disconnect the negative battery cable.

- Use a jack to raise the rear of the Blazer to access the fuel tank.

- Disconnect the filler hose from the gas tank and remove the tank shield.

- Support the tank with the jack while removing the straps.

- Lower the tank and disconnect the fuel hoses and vapor hose from the sending unit.

- Remove the lock ring from the sending unit and take out the sending unit/pump assembly.

- Install the new assembly and secure it with the lock ring.

- Lift the tank and reconnect the hoses and electrical connections.

- Reinstall the mounting straps, shield, and filler hose.

- Lower the Blazer and reconnect the battery cable.

- Turn the key to the run position to prime the new pump.

Disconnect the negative battery cable

Disconnecting the negative battery cable is one of the first steps to take when changing out the fuel pump of a 2004 Chevy Blazer. This is a crucial step as it ensures your safety when performing the task. Here are some detailed instructions to guide you through the process:

Park your Blazer on level ground. Before you begin any work on your vehicle, it is important to ensure that it is parked securely and will not roll or shift unexpectedly.

Locate the negative battery cable. The battery is typically located in the engine compartment, which can be accessed by raising the hood of your vehicle. The battery will have two cables connected to it, one positive (+) and one negative (-). The negative cable is usually black, and you may need to remove a protective cover to access it.

Prepare the necessary tools. You will need a suitable wrench or socket size that fits the battery terminal. It is also recommended to have a pair of gloves and eye protection for safety.

Loosen the nut or bolt securing the negative cable to the battery terminal. Use your wrench or socket to loosen the connection, but do not remove it completely yet. This step helps to break the bond between the cable and the terminal, making the next step easier.

Secure the area. If you are working on any other parts of the vehicle, make sure to cover or protect the now-exposed positive (+) battery terminal to prevent any accidental contact or short circuits. You can use a protective cover or even some electrical tape to secure the area.

By following these steps, you will have successfully disconnected the negative battery cable of your 2004 Chevy Blazer, allowing you to proceed with the next steps of changing out the fuel pump. Remember to always exercise caution when working on your vehicle and refer to a professional mechanic if you have any doubts or concerns.

Jack up the rear of the car and place jack stands underneath

Jacking up your car is an important step in replacing the fuel pump of your 2004 Chevy Blazer. Here is a detailed, step-by-step guide on how to do it:

Park your Chevy Blazer on level ground. This is important to ensure your car is stable and secure while you work underneath it.

Use a jack to raise the rear of the Blazer. You want to achieve a height that gives you the best access to the fuel pump. The Blazer is a higher-riding vehicle, so you won't need to raise it too much.

Once you've reached a suitable height, place jack stands underneath the car. These stands will support the vehicle while you work, so it's important to ensure they are secure and stable.

Now that the car is safely supported by the jack stands, you can lower the jack and move it out of the way. You will no longer need it for this part of the process.

At this point, you should disconnect the filler hose from the gas tank. To do this, simply remove the hose clamp with a Philips head screwdriver.

The next step is to remove the tank shield. This will give you better access to the fuel pump and tank. Use a socket wrench to remove the shield.

Now, bring the jack back and use it to support the tank while you remove the straps. This will help you avoid putting too much strain on the tank and potentially damaging it.

Carefully lower the tank just enough to access the fuel hoses and vapor hose connected to the sending unit. You will disconnect these in the next step.

Disconnect the fuel and vapor hoses from the sending unit. To do this, press in the lock tabs on the hose connectors and gently pull the hoses from the fittings.

Now that the hoses are disconnected, you can lower the fuel tank completely to the floor. Your Blazer is now ready for the next steps in the fuel pump replacement process.

Disconnect the filler hose from the gas tank

Disconnecting the filler hose from the gas tank is a crucial step in replacing the fuel pump of a 2004 Chevy Blazer. This step requires careful attention to detail and a few specific tools.

First, ensure your Chevy Blazer is parked on level ground. This is important for safety and stability when working underneath the vehicle. Next, use a jack to raise the rear of the Blazer to a suitable height that allows you to access the underside of the vehicle. Place jack stands in position to support the vehicle, and then lower the jack and move it out of the way.

Now, you can begin to disconnect the filler hose from the gas tank. Locate the hose clamp that secures the filler hose to the gas tank. Using a Phillips-head screwdriver, carefully loosen and remove the hose clamp. Once the hose clamp is removed, you can gently pull the filler hose away from the gas tank, taking care not to damage any surrounding components.

At this point, the filler hose should be free from the gas tank, but it is still connected to other parts of the vehicle. To completely remove the filler hose, you will need to detach it from these connections as well. Identify the tank shield, which is held in place by bolts or other fasteners. Using a socket wrench, remove the tank shield by loosening and removing the fasteners. With the tank shield out of the way, you will have better access to the filler hose connections.

Locate the point where the filler hose connects to the fuel system and carefully detach it. This may involve pressing in lock tabs on the hose connectors and gently pulling the hoses from their fittings. Be cautious not to spill any fuel and have rags ready to absorb any small spills. Once the filler hose is disconnected from all fittings and connections, set it aside, and you can continue with the next steps of replacing the fuel pump.

Remove the tank shield

To remove the tank shield from your 2004 Chevy Blazer, you will need a jack, two jack stands, and a socket wrench with an extension and socket set.

First, park your Blazer on level ground and relieve the fuel system pressure. Do this by removing the pump relay, wrapping a shop rag around the Schrader valve, and depressing the stem inside. Next, disconnect the negative battery cable.

Use the jack to raise the rear of the Blazer to a height that gives you the most access. Once it’s at a workable height, put the jack stands in place, lower the jack, and move it out of the way.

Now, you can disconnect the filler hose from the gas tank by removing the hose clamp with your screwdriver. Then, remove the tank shield with your socket wrench.

Bring the jack back and use it to support the tank while removing the straps. Carefully lower the tank enough to disconnect the fuel hoses and vapor hose from the sending unit. Press in the lock tabs on the hose connectors and pull the hoses from the fittings. Now, you can unplug the electrical connections and lower the fuel tank to the floor.

Support the tank with the jack and remove the straps

To support the tank with a jack and remove the straps, you will need a jack and a jack stand. Once you have these tools, follow the steps below:

First, use the jack to raise the rear of the Blazer to a height that gives you the most access. With a higher-riding vehicle like a Blazer, it won't need to come up much. Once it's at a workable height, put the jack stand in place, lower the jack, and move it out of the way for now.

Now, bring the jack back and use it to support the tank while removing the straps. Carefully lower the tank enough to disconnect the fuel and vapor hoses from the sending unit. Press in the lock tabs on the hose connectors and pull the hoses from the fittings.

At this point, the tank should be supported by the jack and the straps can be removed. Now, you can unplug the electrical connections and lower the fuel tank the rest of the way to the floor.

It is important to note that this process should be done with safety in mind. Ensure that the Blazer is parked on level ground and that you have relieved the fuel system pressure before beginning. Additionally, always use genuine GM parts when replacing your fuel pump assembly, as many people have reported problems with aftermarket fuel pumps.

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