Mercedes Mullins
If your Chevy truck is suffering from poor gas mileage or won't start at all, you may need to replace the fuel pump. This is a complicated task, but it can be done at home with the right tools and knowledge. The fuel pump is located within a module stored inside the fuel tank, so you'll need to relieve the pressure within the fuel system and remove the tank to access it. You'll then need to disconnect the fuel lines, remove the old fuel pump module, and install a new one. Once the new module is in place, you can reconnect the fuel lines and re-pressurise the fuel system.
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What You'll Learn
Relieve the pressure within the fuel system
To relieve the pressure within the fuel system, open the gas cap on the side of the truck. Then, remove the fuel pump relay from within the fuse box and attempt to start the engine. The vehicle will stall, relieving the fuel pressure.
Next, loosen the clamp connecting the fuel filler neck to the tank with a screwdriver and pull the fuel filler neck loose, removing it. Disconnect all of the fuel lines from the vehicle. This can be done by squeezing the clamps and pulling the line in newer Chevy vehicles.
Thoroughly clean the area around the fuel pump assembly to prevent any contaminants from getting into your gas tank. Loosen and remove the locking ring, which usually requires a counterclockwise turn, assisted by clamps or a hammer and chisel.
Finally, carefully lift the entire fuel pump module out of the gas tank. You may want to lift it partially and allow it to drain before removing it completely.
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Remove the fuel pump relay
To remove the fuel pump relay, you must first relieve the pressure within the fuel system. Open the gas cap on the side, then remove the fuel pump relay from within the fuse box. Attempt to start the vehicle – it will stall. Next, loosen the clamp connecting the fuel filler neck to the tank with a screwdriver, then pull the fuel filler neck loose and remove it. Disconnect all of the fuel lines from the vehicle. Remove all hoses that are connected to the fuel pump assembly. You can do this by squeezing the clamps and pulling the line.
Thoroughly clean the area around the fuel pump assembly to prevent any contaminants from getting into your gas tank when you loosen the gas tank’s locking ring that keeps the fuel pump firmly connected to the tank. Loosen and remove the locking ring (this usually requires a counterclockwise turn, assisted by clamps or a hammer and chisel). Carefully lift the entire fuel pump module out of the gas tank. You may want to lift it partially and allow it to drain before completely removing it.
Remove the new fuel pump module from the box (you may be required to install the float arm and fuel pump seal). Lubricate the fuel pump module’s seal. Carefully lower the new fuel pump module into the tank, making sure to line the fuel pump assembly’s tab up with the marker on the fuel tank.
Replace the fuel tank and reinstall the gas tank straps. Reattach the fuel filler neck to the tank, making sure that the clamp is firmly secured. Reconnect the electrical plugs to the fuel pump. Reconnect all of the fuel lines to the vehicle.
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Loosen the clamp connecting the fuel filler neck to the tank
Before loosening the clamp, it is important to relieve the pressure within the fuel system. This can be done by opening the gas cap on the side, removing the fuel pump relay from the fuse box, and then starting the engine until it stalls. This will ensure that the fuel tank is safe to work on.
Additionally, it is recommended to clean the area around the fuel pump assembly to prevent any contaminants from entering the gas tank when you loosen the tank's locking ring. This locking ring is what keeps the fuel pump firmly connected to the tank, so it is important to loosen it carefully, usually with a counterclockwise turn, assisted by clamps or a hammer and chisel.
Once the locking ring is loosened, you can carefully lift the entire fuel pump module out of the gas tank. You may want to lift it partially and allow it to drain before completely removing it. Remember to handle the fuel pump module with care, as it is a crucial component of your Chevy truck's fuel system.
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Disconnect the fuel lines
Disconnecting the fuel lines is a crucial step in replacing the fuel pump on a Chevy truck. Here's a detailed guide on how to safely and effectively complete this task:
Firstly, it is important to relieve the pressure within the fuel system. This can be done by opening the gas cap on the side of the truck and removing the fuel pump relay from the fuse box. Attempt to start the vehicle, and it will stall, indicating that the pressure has been relieved. Next, loosen the clamp connecting the fuel filler neck to the tank using a screwdriver. Pull the fuel filler neck loose and remove it carefully.
Now, you can proceed to disconnect the fuel lines from the vehicle. In newer Chevy vehicles, this can be done by simply squeezing the clamps and pulling the line. Ensure that you disconnect all the fuel lines, as missing any could lead to complications later on. Once all the fuel lines are disconnected, it is important to clean the area around the fuel pump assembly to prevent any contaminants from entering the gas tank when you remove the fuel pump.
At this point, you are ready to remove the fuel pump module itself. Loosen and remove the locking ring that keeps the fuel pump connected to the tank. This usually requires a counterclockwise turn, and you may need to use clamps or a hammer and chisel to assist with this step. Carefully lift the entire fuel pump module out of the gas tank, being mindful of any remaining fuel. It is recommended to lift the module partially and allow it to drain before completely removing it to avoid spills.
Finally, with the fuel pump module removed, you can now prepare to install the new one. Ensure that the new pump module has a fresh seal, and align the fuel line fittings with the lines as you install the module in the tank. Press the module down firmly until it is seated correctly. Now, you can proceed to the next steps of replacing the fuel tank and reconnecting the fuel lines, as outlined in other guides.
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Remove the fuel pump assembly
To remove the fuel pump assembly, you will need to relieve the pressure within the fuel system. Open the gas cap on the side, remove the fuel pump relay from within the fuse box, then start the engine and let it stall. Loosen the clamp connecting the fuel filler neck to the tank with a screwdriver and pull the fuel filler neck loose and remove it. Disconnect all of the fuel lines from the vehicle (this can be done by squeezing the clamps and pulling the line in newer Chevy vehicles). Remove all hoses that are connected to the fuel pump assembly (as with the end that was connected to the car, this can be done by squeezing the clamps and pulling the line in newer Chevy vehicles).
Thoroughly clean the area around the fuel pump assembly to prevent any contaminants from getting into your gas tank when you loosen the gas tank’s locking ring that keeps the fuel pump firmly connected to the tank. Loosen and remove the locking ring (loosening usually requires a counterclockwise turn, assisted by clamps or a hammer and chisel). Carefully lift the entire fuel pump module out of the gas tank (you may want to lift it partially and allow it to drain before completely removing it).
You may be required to install the float arm and fuel pump seal. Lubricate the fuel pump module’s seal, carefully lower the new fuel pump module into the tank, and make sure to line the fuel pump assembly’s tab up with the marker on the fuel tank.
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Frequently asked questions
Open the gas cap on the side, remove the fuel pump relay from the fuse box, then start the engine and let it run until it stalls.
Remove all hoses connected to the fuel pump assembly, then clean the area around the fuel pump assembly to prevent contaminants from getting into your gas tank. Loosen and remove the locking ring, then carefully lift the entire fuel pump module out of the gas tank.
Make sure the new pump module has a fresh seal, then align the fuel line fittings with the lines as you install the module in the tank, pressing the module down until it is seated. Install the retaining ring, making sure it is fully seated, and the locking tab is within the ring's slot.
