Regan Brown
Fuel pumps are essential components of a car's fuel system, and when they fail, it can lead to significant issues. Some Suburban models have two fuel pumps, and replacing them can be a challenging task. The process often involves jacking up the vehicle, disconnecting components, and draining and removing the fuel tank. Due to the complexity of the task, many Suburban owners choose to replace their in-tank fuel pumps with external pumps or upgrade to an aftermarket fuel pump to improve performance and fuel economy. This paragraph introduces the topic of adding an aftermarket fuel pump to a Suburban, highlighting the challenges of fuel pump replacement and the potential benefits of aftermarket solutions.
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What You'll Learn
Cutting a hole in the floor to access the tank
Cutting a hole in the floor to access the fuel tank is a possible method of reaching the pump for repair or replacement. However, it is not without its risks, and some people prefer to avoid it. For instance, one person on a forum noted that they wished they had an access panel under the carpet to reach the pump from above, but they did not want to cut a hole in the floor.
If you do decide to cut a hole in the floor to access the fuel tank, there are several methods you can use. One person on a forum suggested loosening the straps holding the tank in place so that it lowers slightly, then sliding a piece of plate steel between the floor and the tank before cutting. This will help to prevent any accidental damage to the tank while cutting. You can then use an angle grinder to cut a hole in the floor and access the pump.
Another forum user suggested using an air chisel to cut around the fuel tank, noting that they had used a grinder before and it was "not that big of a deal" as long as they were careful. However, they also warned of the potential dangers of using a grinder, including sparks, grinding debris, and the potential to burn up the vehicle or break windows.
It is important to note that cutting a hole in the floor of your vehicle will likely require some form of repair or patching to ensure the hole is properly sealed and does not cause any further issues. One person on a forum suggested using butyl tape to seal under the patch, then using flowable caulking over the seam to create a removable but secure seal. Another forum user noted that they replaced the cut-out piece of the floor with a metal border soldered on and a hinge so that it could be opened and closed like a lid.
While cutting a hole in the floor to access the fuel tank and pump may be a viable option for some, it is important to carefully consider the risks and take the necessary precautions to ensure a safe and effective repair.
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Removing the fuel pump
Park Your Vehicle and Prepare the Work Area:
- Find a suitable work area where you can safely raise your Suburban and access the fuel tank. Make sure the surface is firm and level.
- Set the parking brake and ensure the vehicle is securely parked.
- Put on the necessary safety gear, including gloves and eye protection, to protect yourself from any fuel spillage or debris.
Locate the Fuel Pump and Related Components:
- Identify the fuel pump's location, which is usually inside the fuel tank. Refer to your Suburban's service manual or seek advice from automotive forums specific to your vehicle model.
- Open the fuel cap and have an assistant turn the key to the "ON" position. Listen carefully at the filler opening for the fuel pump's hum, which indicates proper functioning.
- Verify the fuel pump fuse and relay to ensure you are dealing with the correct components.
Clean the Area and Prepare for Removal:
- Before removing the fuel pump, clean the surrounding area to prevent dirt and debris from falling into the fuel tank.
- Consider replacing related components, such as the fuel filter, fuel pump strainer, and fuel tank O-ring or gasket, to optimize the performance of your new fuel pump.
Drain the Fuel Tank (Optional):
- Some people choose to drain the fuel tank completely before removing the fuel pump. However, this can be a challenging task, especially with a large amount of fuel in the tank.
- If you decide to drain the fuel, use a siphon hose to carefully remove the fuel and store it in an approved container. Make sure to follow all safety precautions when handling flammable liquids.
Access the Fuel Pump:
- Depending on your Suburban's design, you may need to lower the fuel tank or create access from above. Some models have an access panel or a removable floor section that allows easier access to the fuel pump.
- If you need to cut a hole in the floor or modify the vehicle's structure, make sure to have a plan for properly sealing and repairing the modification after the fuel pump is replaced.
Remove the Fuel Pump:
- Once you have gained access to the fuel pump, carefully disconnect any electrical connectors and fuel lines attached to it.
- Take note of the routing and orientation of the fuel lines and any mounting hardware to facilitate proper reassembly.
- Remove the mounting screws or bolts holding the fuel pump in place and carefully lift it out of its housing.
Remember to take your time and work carefully to avoid any damage to surrounding components. Always refer to vehicle-specific repair manuals or seek advice from experienced mechanics or automotive forums when undertaking such tasks.
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Cleaning the tank
Step 1: Safety First
Before beginning the cleaning process, it is important to prioritize your safety. Always work in a well-ventilated area and keep a fire extinguisher nearby. Avoid smoking or working near any potential sources of ignition, such as pilot lights or incandescent light bulbs. Wear safety gear, including glasses and gloves, to protect yourself from any harmful substances or spills. Keep clean-up materials close at hand to immediately address any accidental spills.
Step 2: Prepare the Tank
Start by relieving the fuel pressure prior to opening the fuel systems. Failing to do so can lead to dangerous fuel sprays and potential injury. Store the fuel in an approved container, such as a gas caddy or gas can. Allow the tank to dry for at least 30 minutes to ensure that any residual fuel vapors dissipate.
Step 3: Exterior Cleaning
Begin by cleaning the exterior of the fuel tank. Use appropriate tools to remove rust and debris that may have accumulated on the outside of the tank. This step is crucial, as any external debris can find its way into the tank and cause damage to the new fuel pump.
Step 4: Remove the Old Fuel Pump and Lines
Disconnect and remove the existing fuel pump from the tank. This step may vary depending on the specific model of your Suburban. Refer to your vehicle's repair manual or seek guidance from online resources specific to your Suburban model. Additionally, remove the lines connected to the fuel pump to ensure that the tank is ready for the next step.
Step 5: Siphon the Fuel
Use a siphon hose to remove any remaining fuel from the tank. Insert the hose past the gas filler slosh flapper, guiding it down into the tank. Some Suburban models may have a rollover valve, which can make siphoning fuel challenging. If you encounter this issue, consider consulting a mechanic or seeking model-specific advice online.
By following these steps, you will have a clean fuel tank that is ready for the installation of your aftermarket fuel pump. Remember, taking the time to properly clean your fuel tank will save you from potential headaches down the road.
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Installing the new fuel pump
Installing a new fuel pump can be a challenging task, especially for larger vehicles like the Chevrolet Suburban. Here is a step-by-step guide on how to approach the installation of a new fuel pump:
Firstly, it is important to understand the layout of the fuel system in your Suburban. Some models have a single tank, while others, like the 2000 model, have two tanks. If your vehicle has two tanks, one is located at the rear, above the spare tire, and the other is mounted inside the framerail on the driver's side. Once you have identified the location of the tank(s), you can proceed with the necessary steps to access the fuel pump.
If you are considering an aftermarket fuel pump, you may want to switch from an in-tank fuel pump to an external pump. This option has been discussed by several Chevrolet enthusiasts, and there are products or kits available for this conversion.
Now, to install the new fuel pump, you have a few options. One approach is to drain the fuel tank(s) and then remove the old pump. This can be a challenging task, as some tanks hold a significant amount of fuel. You may need to disconnect various components, such as emissions parts, fuel lines, and wiring connectors. It is important to follow safety procedures and have the necessary tools, such as a floor jack, plywood, and line tools.
Another option is to cut a hole in the floor of the Suburban to access the fuel pump from above. This method can be more convenient and is a popular choice for those who want to avoid the challenge of draining the tank and working underneath the vehicle. It is recommended to replace the cut-out section with a metal sheet or a hinged lid to maintain the integrity of the floor.
Once you have accessed the fuel pump, carefully remove the old pump and any necessary fuel lines or wiring. Clean the tank(s) thoroughly to avoid any dirt or debris getting inside. Then, install the new fuel pump, ensuring that all connections are secure and properly fitted. If you are installing an external pump, follow the product instructions for the conversion kit.
Finally, after installing the new fuel pump, it is important to test the vehicle to ensure that everything is functioning correctly. Start the engine and check for any leaks or unusual noises. If you have recently worked on the fuel system, it is recommended to test drive the vehicle and refill the tank(s) to ensure the pump is operating as expected.
Remember to consult a professional mechanic or a trusted workshop if you are unsure about any steps or procedures. They can provide additional guidance and ensure a safe and proper installation.
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Reinstalling the tank
Next, reconnect the three fuel lines on the pump and the wiring connector. Ensure that all emissions components under the truck that were previously disconnected are properly reconnected.
Once the tank is in place and all the connections are secure, you can lower the truck back down to the ground. Before fully installing the tank, it is recommended to turn on the ignition and check if the pump is functioning properly.
After confirming that the pump is working, you can proceed to close up any access points created during the removal process. This may involve patching up any holes cut in the floor or soldering a metal border with a hinge to create a lid, as some Suburban models may have a challenging design that requires accessing the tank from the top.
Finally, refill the tank with fuel and test-drive the Suburban to ensure that the fuel pump is functioning optimally.
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Frequently asked questions
There are several ways to replace the fuel pump in a Suburban. One way is to drain the tank, clean it, and reinstall it. Another way is to cut a hole in the floor, take out the pump, and replace the cut-out bit with a metal border soldered on and a hinge. You can also replace the fuel pump by jacking up the driver’s side of the truck, dropping the main tank, and pulling it out.
A sudden overconsumption of fuel is a common sign of fuel pump failure. Another sign is a noisy fuel pump.
Some fuel pump options for the Suburban include the A/C Delco pump, the Carter pump, and the Delphi pump.
Aftermarket fuel pumps can optimize fuel economy and overall performance. They can also help to prevent a flooded engine and provide a smoother ride.
