Ameer Randolph
Replacing the fuel pump on a 1988 Chevy Suburban is not a quick or easy job. It depends on how much fuel is in the tank, which can't be siphoned out before dropping it. Some people cut a hole in the floor and replaced the pump from above, screwing a sealed plate over the hole. Others have taken the pump down to the ground, drained it, and then reinstalled it. There are also some troubleshooting steps you can take to determine whether the issue is with the pump or the power to the pump, such as replacing fuses or scuffing the blades that slide in.
| Characteristics | Values |
|---|---|
| Installation labour | High |
| Fuel in the tank | Cannot be siphoned out before dropping it |
| Installation method | Cut a hole in the floor and replaced it from above, screwing a sealed plate over the hole |
| Fuel pump module electrical harness | Some wires were prone to shave through and cause a ground |
| Fuel pump operation | 12v power into the system |
| Troubleshooting | Suspect open ECM to Fuel Pump Relay circuit, or faulty ECM driver |
| Replacement method | Take it down to the ground, drain it, and then reinstall it |
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What You'll Learn
Cutting a hole in the floor to replace the fuel pump
To replace the fuel pump in a 1988 Chevy Suburban, you will need to cut a hole in the floor. This is because it is difficult to siphon out the fuel in the tank before dropping it.
One way to do this is to cut a hole in the floor, take out the pump, and then replace the cut-out section with a metal border soldered on and a hinge so it works like a lid. You can then screw a sealed plate over the hole.
Alternatively, you can take the fuel pump down to the ground, drain it, and then reinstall it. However, be aware that this method may not be effective long-term, as one user reported the same fuel pump failure a year later.
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Troubleshooting the fuel pump
Firstly, check the power supply to the fuel pump. Ensure that the 12v power system is functioning correctly, as this is essential for fuel pump operation. You can do this by selecting the left fuel tank and turning the ignition key to the 'run' position. Listen for the left fuel pump to run for two seconds. Repeat this process for the right fuel tank. If there is no pump operation, suspect an open ECM to Fuel Pump Relay circuit or a faulty ECM driver.
Another common issue with fuel pumps is faulty or old fuses. Replace the fuses or scuff the blades that slide in to improve conductivity. Oxidation on the blade surface can reduce the effectiveness of older fuses.
If your fuel pump is acting up, it may be worth investigating other issues. For example, there was a recall on the fuel pump module electrical harness for some Chevy Suburban models due to wires that were prone to shave through and cause a ground. This could affect the tank gauge and fuel pump performance.
When replacing the fuel pump, you may need to cut a hole in the floor and replace it from above, screwing a sealed plate over the hole. Alternatively, you can take the pump down to the ground, drain it, and then reinstall it. However, this process can be time-consuming and labour-intensive, especially if there is a significant amount of fuel in the tank.
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Replacing the fuses
To replace the fuel pump, you will need to cut a hole in the floor of the car and then take out the pump. You can then replace the cut-out bit with a metal border soldered on and a hinge so it works like a lid. Alternatively, you can screw a sealed plate over the hole.
Before replacing the pump, you should check the fuses. Old fuses don't conduct well when oxidation forms on the blade surface. You can replace the fuses or scuff the blades that slide in.
If you are experiencing issues with your fuel pump, you can also try troubleshooting. With the left fuel tank selected, start with the ignition key off, then turn the key to run. If you hear the left fuel pump run for two seconds, then the pump is working. Repeat this process with the right fuel tank selected. If there is no pump operation, then you may have an open ECM to Fuel Pump Relay circuit, or a faulty ECM driver.
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Draining the tank
To drain the tank, you will need to cut a hole in the floor of the car and take out the pump. One way to do this is by soldering a metal border with a hinge onto the floor, so that the cut-out section can be replaced and function as a lid. Once the pump is accessible, you can drain the tank and then reinstall a new pump.
It is important to note that some people have reported issues with fuel pump failure even after following this process. Therefore, it may be necessary to investigate other potential issues, such as a recall on the fuel pump module electrical harness, which could cause wires to shave through and result in a ground.
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Taking the fuel pump to the ground
To replace the fuel pump in a 1988 Chevy Suburban, you'll need to take it down to the ground, drain it, and then reinstall it. This can be a tricky job, as it depends on how much fuel is in the tank, which can't be siphoned out before dropping it. One way to get around this is to cut a hole in the floor and replace the pump from above, screwing a sealed plate over the hole. Another method is to cut a hole in the floor, take out the pump, and then replace the cut-out bit with a metal border soldered on and a hinge so it works like a lid.
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Frequently asked questions
You can 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 so it works like a lid.
With the left fuel tank selected, start with the ignition key off, then turn the ignition key to run. If you don't hear the left fuel pump run for two seconds, record the result and do the same for the right fuel tank. If there is no pump operation, then suspect an open ECM to Fuel Pump Relay circuit, or a faulty ECM driver.
You may need to replace the fuses or scuff the blades that slide in. Old fuses don't conduct as well when oxidation forms on the blade surface.
It depends on how much fuel is in the tank, which can't be siphoned out before dropping it.
