Replacing Traverse Fuel Tank Pressure Sensor: Step-By-Step Guide

The fuel tank pressure sensor is an integral part of a vehicle's evaporative emissions (EVAP) system, which helps control fuel vapour emissions. It constantly monitors pressure in the fuel tank to detect leaks and ensure vapours are contained within the EVAP system. This process is essential for maintaining fuel efficiency, reducing emissions, and optimising engine performance. When the sensor detects a leak or a loose gas cap, it sends a signal to the vehicle's computer, which then alerts the driver by turning on the check engine light. While a vehicle may still run with a faulty sensor, it is not advisable to drive for extended periods as it can lead to increased emissions and potential engine performance issues. Replacing the sensor typically involves relieving the fuel system pressure, removing the fuel tank, replacing the sensor, and reassembling the components. The cost of replacement varies depending on the vehicle's make and model, but generally includes both parts and labour.

Disconnect the negative battery cable

Disconnecting the negative battery cable is an important step when replacing the fuel tank pressure sensor in your car. Here is a detailed guide on how to do this:

Locate the negative battery terminal: The negative terminal is usually marked with a "-" symbol or a black cover. It is often on the left side of the battery, but this may vary depending on your car model. Before you begin, ensure you have the necessary tools, such as a wrench or socket set, safety goggles, and gloves.

Prepare the workspace: Park your car on a level surface and engage the parking brake. If possible, move the car to a well-ventilated area or outdoors. Turn off the engine and remove the keys from the ignition. Open the hood and identify the battery.

Loosen the negative battery cable: Using the appropriate tool, loosen the nut or bolt that secures the negative battery cable to the terminal. Do not allow the tool to touch any other part of the battery, as it can cause sparks and potential damage.

Disconnect the cable: Once the nut or bolt is loosened, carefully remove the cable from the terminal. Be cautious not to let the cable touch any metal parts of the car, including the battery, as it may cause a short circuit. If the cable is stiff or difficult to remove, gently wiggle it free without forcing it.

Secure the cable: Ensure that the cable is safely secured away from the battery and any metal components. You can use a cable tie or wrap the cable with electrical tape to prevent accidental contact. This step is crucial for safety.

Work safely: Throughout the process, be mindful of your safety and the car's electrical system. Do not smoke or work near open flames. Avoid wearing metallic jewellery or clothing that could potentially touch the battery or electrical components. Keep a box of baking soda nearby in case of battery acid spills.

Reinstallation: When you have completed the necessary repairs or replacements, carefully reconnect the negative battery cable to the terminal and tighten the nut or bolt securely. Ensure that the cable is firmly attached and there is good contact between the cable and the terminal.

By following these steps, you can safely disconnect and reconnect the negative battery cable when replacing the fuel tank pressure sensor in your car. Remember to refer to your car's repair manual for any model-specific variations and always work with caution when dealing with electrical systems.

Relieve the pressure from the fuel system

To relieve the pressure from the fuel system of a Chevrolet Traverse, follow these steps:

Firstly, disable the fuel pump by removing the fuse. Next, crank the ignition to release any residual pressure in the fuel system. Then, disconnect the battery. On some cars, the fuel tank and pump assembly can be accessed from inside the passenger compartment, so the next step would be to remove the back seat and an access cover in the floor. If not, the fuel tank will need to be removed from underneath the vehicle to gain access to the fuel pump assembly. Once you have access to the assembly, you can start to unplug the wiring harness connectors and detach the fuel lines.

Now, you can remove the retaining ring holding the fuel pump assembly in place and pull it out of the tank. The fuel temperature sensor is part of this assembly and can be unplugged and detached. A new sensor can then be installed, and the pump is reinserted into the tank and secured. If the fuel tank was removed, it should now be reinstalled, and the fuel system can be tested.

It is recommended to install a new fuel pump assembly gasket when replacing the fuel temperature sensor. Additionally, any mounting hardware for the fuel tank that may be compromised should also be replaced. It is important to disable the electrical system during this process to prevent accidental arcing of wires, which could ignite the open fuel system.

If you are attempting to relieve fuel system pressure when the car cannot be started, there is a Schrader valve (similar to a bicycle tire valve) located on the fuel rail. Removing the plastic cap and pushing down on the valve stem will release a small amount of fuel, reducing the pressure.

Remove the fuel tank

To remove the fuel tank, you will need to relieve the system's fuel pressure. Refer to your vehicle's instructions for relieving fuel pressure. Once the pressure is relieved, drain the fuel tank. You can refer to your car manual for instructions on how to do this. After the tank is drained, you can then remove it. The process of removing the fuel tank can vary depending on the vehicle's make and model. In some cases, it may be necessary to raise the vehicle and support it with jack stands to access the tank. Once the tank is removed, you can then replace the fuel tank pressure sensor.

It is important to note that removing the fuel tank and replacing the pressure sensor can be a complex task, and it may be best left to professionals if you are not experienced with vehicle repairs. Additionally, always refer to your vehicle's manual for specific instructions and safety precautions before attempting any repairs or maintenance.

Disconnect the wiring harness from the faulty sensor

Disconnecting the wiring harness from the faulty sensor is a crucial step in replacing your fuel tank pressure sensor. Here is a detailed guide to help you through the process:

Locate the Fuel Tank Pressure Sensor: The fuel tank pressure sensor is typically found on top of the fuel pump module, which is either mounted on or inside the fuel tank. In some vehicles, you may be able to access the sensor from inside the passenger compartment by removing the back seat and an access cover in the floor. In other cases, you may need to remove the fuel tank from underneath the vehicle to gain access.

Prepare the Vehicle: Before disconnecting the wiring harness, ensure you have relieved the residual pressure in the fuel system. This can be done by disabling the fuel pump, often by removing a fuse, and cranking the ignition. Also, disconnect the battery to avoid any electrical issues during the process.

Access the Sensor: Once you have located the sensor and prepared the vehicle, you will need to safely raise the vehicle and support it with jack stands. This will provide you with the necessary access to the fuel tank and the sensor.

Disconnect the Wiring Harness: The wiring harness is the bundle of wires connected to the fuel tank pressure sensor. To disconnect it, locate the connector. You may need to clean any debris or corrosion from around the connector to access it properly. Depress the small tab on the top of the connector, and use needle-nose pliers to gently pull the connector apart if it is stuck. Be careful not to damage the connector or the wires.

Remove the Faulty Sensor: After successfully disconnecting the wiring harness, you can now remove the faulty sensor. Pay attention to any retaining rings or fasteners that hold the sensor in place, and make sure to unplug it from the assembly.

Remember, working on fuel-related components can be dangerous, so it is essential to take proper safety precautions and ensure the area is well-ventilated. If you are unsure or uncomfortable with any part of the process, it is best to consult a qualified technician or seek professional assistance.

Reinstall the fuel tank and reconnect the battery

Once you have successfully replaced the fuel tank pressure sensor, you can reinstall the fuel tank and reconnect the battery. Here is a step-by-step guide:

Reinstalling the Fuel Tank:

• Place the fuel tank back into the vehicle, ensuring it is secure and stable.
• Reconnect the filler fuel hose and the electrical connector to the fuel pump.
• Reinstall the straps and bolts that hold the fuel tank in place.
• Fill the gas tank with fuel.

Reconnecting the Battery:

• Locate the battery in your vehicle. It is typically located in the engine compartment, near the front of the vehicle.
• Identify the negative battery cable, usually black and connected to the negative terminal marked with a '-' symbol.
• Carefully reconnect the negative battery cable to the terminal and tighten it securely.
• Verify that the battery is reconnected by checking if the electrical systems, such as the radio, interior lights, and power windows, are functioning normally.

By following these steps, you will have successfully reconnected the battery and completed the fuel tank pressure sensor replacement process.

Frequently asked questions