Sylvie Willis
If the service engine light on your 2000 Chevy Blazer comes on periodically, you may need to replace the fuel tank pressure sensor. This sensor is located on top of the fuel tank or fuel pump module and can be replaced without removing the module from the tank. However, you will likely need to lower the tank a couple of inches to access it. Before attempting any repairs, it is recommended to consult a qualified mechanic or a service manual for specific instructions and safety information.
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What You'll Learn
The sensor is located on top of the fuel tank
The fuel tank pressure sensor is located on top of the fuel tank of your 2000 Chevy Blazer. This sensor is part of the emissions system and monitors the fuel tank vacuum pressure. It is not to be confused with the fuel pressure sensor.
To access the fuel tank pressure sensor, you will need to lower the tank a couple of inches. It is clipped to the top of the fuel pump module, which is located in the centre of the top of the fuel tank. The sensor has a three-wire harness connected to it, with two connectors. The four-wire connector on the pump module is for the fuel pump and sender, while the other three-wire connector is for the pressure sensor.
When attempting to locate the sensor, you will see that the fuel pump module has a large hole in the centre, where the fuel pump was previously located. The pressure sensor is the round, plastic component located just below this hole.
It is important to note that before attempting to access and replace the fuel tank pressure sensor, you should consider checking and replacing your gas cap, as a faulty cap can cause similar issues.
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You must drop the tank to access the sensor
To replace the fuel tank pressure sensor on a 2000 Chevy Blazer, you must drop the tank to access the sensor. This is because the sensor is located on top of the fuel tank, and dropping the tank is the only way to reach it.
The fuel tank pressure sensor is part of the fuel tank assembly, which includes the fuel pump and sender. The sensor has a three-wire harness connected to it, and it monitors fuel tank vacuum pressure. To replace the sensor, you will need to disconnect the electrical connector and open the retaining clip before removing the sensor.
It is important to note that dropping the tank can be a complex and time-consuming task. You will need to raise and support the vehicle securely, and it is recommended to refer to a professional mechanic or a repair manual for specific instructions on how to safely raise and support your car.
Additionally, before dropping the tank, it is worth considering other potential causes for the "service engine soon" light. For example, a bad gas cap can trigger the same warning, so it is worth replacing the gas cap before attempting the more complex task of dropping the fuel tank.
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The sensor is held in place by an O-ring seal
The fuel tank pressure sensor on a 2000 Chevy Blazer is located on top of the fuel tank. To access it, you will need to drop or lower the tank. The sensor is held in place by an O-ring seal, which means it should be relatively easy to remove and replace.
- Locate the fuel tank: The fuel tank is located at the rear of the vehicle, underneath the body. You may need to raise or jack up the vehicle to access it safely.
- Lower the fuel tank: Before lowering the fuel tank, make sure to follow the necessary safety precautions. Release any retaining straps or brackets holding the tank in place, and carefully lower it down.
- Locate the fuel tank pressure sensor: The sensor is located on top of the fuel pump module. It has a three-wire harness connected to it.
- Remove the old sensor: Grasp the sensor and pull it free from the fuel pump module. It should come out relatively easily due to the O-ring seal. If it is stuck, you can try gently shaking or tapping it to loosen it. Be careful not to damage the surrounding components.
- Install the new sensor: Take the new sensor and insert it into the same location, ensuring it is securely seated and the O-ring seal is intact.
- Reconnect the wiring harness: Ensure the wiring harness is properly connected to the new sensor.
- Reinstall the fuel tank: Carefully lift the fuel tank back into place and secure it with the retaining straps or brackets.
- Test the sensor: Start the vehicle and check for any error codes or warning lights related to the fuel tank pressure sensor.
By following these steps, you can replace the fuel tank pressure sensor on your 2000 Chevy Blazer. Remember to consult a qualified mechanic if you are unsure about any part of the process or if complications arise.
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The sensor has a three-wire harness
The fuel tank pressure sensor in a 2000 Chevy Blazer is located on top of the fuel pump module. It has a three-wire harness, with two connectors, that needs to be disconnected before you can remove the sensor. The sensor is clipped to the top of the module and can be replaced without removing the module from the tank, but you will probably need to lower the tank a couple of inches to replace it.
To disconnect the wiring harness, you will need to press the two small clips together, then slide out a plastic piece before popping out the sensor. This can be tricky, as it is hard to see and access the sensor. It may be helpful to remove the skid plate and evap assembly completely to get a better view.
Once you have accessed the sensor, it should simply pop out. Be sure to note how it is positioned so that you can install the new one correctly. Press or clip the new sensor into place, ensuring it is secure. Then, reconnect the wiring harness, ensuring the connectors are secure.
It is important to note that the fuel tank pressure sensor is different from the fuel pressure sensor, which monitors the pressure within the fuel delivery line. The fuel tank pressure sensor helps detect fuel vapour leaks, such as faulty or loose gas caps, and is part of the EVAP system.
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You might not need to drop the tank if you have ZR2 suspension
If you have ZR2 suspension on your 2000 Chevy Blazer, you might be able to avoid dropping the fuel tank to replace the pressure sensor. The fuel tank pressure sensor is located on top of the fuel pump module, which is inside the fuel tank. On some Chevy Blazer models, you may need to lower the tank a couple of inches to access the sensor.
However, the ZR2 suspension is slightly higher than the standard suspension and typically has larger tires. This extra clearance can make it possible to access the fuel tank pressure sensor without fully dropping the tank. Here are the steps you can follow to replace the fuel tank pressure sensor on a 2000 Chevy Blazer with ZR2 suspension:
- Locate the fuel tank and fuel pump module: The fuel tank is located underneath the vehicle, and the fuel pump module is inside the tank. The fuel tank pressure sensor is located on top of the fuel pump module.
- Access the fuel tank: Jack up the vehicle and safely support it on jack stands. You may need to remove any underbody panels or shields to access the fuel tank.
- Lower the fuel tank: While you may not need to fully drop the fuel tank, you will likely need to lower it slightly to access the fuel pump module and pressure sensor. Be careful not to damage any fuel lines or electrical connections when lowering the tank.
- Locate and replace the fuel tank pressure sensor: With the fuel tank lowered, you should be able to access the fuel pump module. The fuel tank pressure sensor is located on top of the module and has a three-wire harness connected to it. Disconnect the harness and remove the old sensor. Install the new sensor and secure it in place, then reconnect the wire harness.
- Reinstall the fuel tank: Carefully raise the fuel tank back into position and secure it in place. Reconnect any fuel lines or electrical connections that were disconnected.
- Test the system: Once the new fuel tank pressure sensor is installed, start the vehicle and check for any leaks or issues. Ensure that the "Service Engine Soon" light does not come on.
By following these steps, you may be able to replace the fuel tank pressure sensor on your 2000 Chevy Blazer with ZR2 suspension without fully dropping the fuel tank. However, please note that working on fuel systems can be dangerous, and it is always recommended to consult a qualified mechanic if you are unsure about any part of the process.
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Frequently asked questions
The fuel tank pressure sensor is located on top of the fuel tank.
You must drop the tank to access the sensor.
The service engine light coming on periodically could be a sign of a defective fuel tank pressure sensor. However, it could also be a bad gas cap, so it is recommended to try changing the gas cap first.
You will need to refer to the service manual for the specific steps. It appears the sensor is held in place by an O-ring seal, so you should be able to pull it free if you can reach it.
No, these are two different sensors. The fuel tank pressure sensor is located on top of the fuel tank, while the fuel pressure sensor is located underneath the upper intake plenum on the side of the fuel injector metering body.
