Rajan Wilcox
Replacing a fuel tank pressure sensor can be a costly affair, with mechanics charging up to $500 for the repair. The sensor is emissions-related, so a faulty sensor may cause you to fail an inspection in an emissions state. However, apart from that, your vehicle's performance should remain unaffected. Before spending money on replacing the sensor, it is recommended to get a proper diagnosis, as the sensor rarely malfunctions, and the issue could be something else, such as an evap leak or a bad fuel cap.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Cost of replacement | $500 |
| Possible causes of error code | Faulty sensor, bad fuel cap, evap leak |
| Location of fuel tank pressure sensor | Near the evap canister assembly |
| Steps to replace the sensor | Disconnect the wiring harness, disconnect the hose, remove the whole evap assembly, and replace the sensor |
| Tools required | None mentioned, but basic hand tools are likely needed |
| Vehicle models with relevant discussions | 2007-2013 Chevrolet Silverado 1500 5.3L V8, 2009 Cadillac SRX, 2015 Chevy Impala, 2001 GMC Sierra, 2002 Grand Marquis, Chevy Silverado 2500HD 8.1L, 2000 S10 Blazer, 2007 Volvo XC90, 1999 Boxster, 2008 Suburban |
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What You'll Learn
Diagnosing the issue: evap leak or faulty sensor
The fuel tank pressure (FTP) sensor is an important part of the evaporative emissions control system, also known as EVAP. It is designed to capture unburnt fuel vapours and reintroduce them into the fuel system. The FTP sensor monitors the pressure, both positive and negative, inside the fuel tank. It is responsible for detecting leaks in the fuel system, such as an evaporative leak or a bad seal on the fuel cap.
When the FTP sensor detects a leak, it alerts the ECU to trigger the "Check Engine" light. However, there are numerous reasons why the "Check Engine" light may come on, and it is not always due to a faulty sensor. A mechanic can read a trouble code to determine if the issue is a leak in the evaporative emissions system or a faulty sensor.
If your vehicle does not have a test port, you can connect to the tank via the fuel filler using an adapter. Fill it with smoke and check for leaks. EVAP systems operate at very low pressure, so testing at pressures above 7 psi could damage the pressure sensor. Always use a smoke machine that regulates the applied pressure to less than 7 psi.
If you are having trouble locating the leak, you may need to remove the rear seat or drop down the gas tank for a closer examination. It is important to replace all questionable parts, as even rust on a retaining ring can cause a leak.
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Disconnecting the wiring harness and hose
Locate the fuel tank pressure sensor near the evap canister assembly. Identify the wiring harness and hose connected to the sensor. The wiring harness is a bundle of wires that transmit power and signals to the sensor, while the hose is typically used to transport fuel or vapours. Before proceeding, ensure the engine is turned off and the fuel system is depressurized for safety.
To disconnect the wiring harness, carefully release the connector locking mechanism. This mechanism varies depending on the vehicle's year, make, and model. It could be a simple clip or a more complex latch that requires a specialized tool to release. Gently pull on the connector to detach it from the sensor. Avoid forcing it, as the connector may have delicate locking tabs that could break. If it's challenging to release, refer to the vehicle's repair manual for specific instructions or seek guidance from a qualified mechanic.
Once the wiring harness is disconnected, proceed to disconnecting the hose. This process may involve removing clamps, couplers, or other fasteners securing the hose to the sensor. Ensure you have the appropriate tools to loosen or remove these fasteners without damaging them or the surrounding components. When disconnecting the hose, be cautious of any residual fuel or vapours that may be present. Have rags or absorbent materials ready to catch any spills or leaks.
After successfully disconnecting the wiring harness and hose, set them aside, ensuring they are safely out of the way and won't cause any accidental connections or obstructions as you continue with the fuel tank pressure sensor replacement. Remember to refer to vehicle-specific repair manuals or seek expert advice if you encounter any challenges during this process.
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Removing the whole evap assembly
First, locate the evap canister assembly in your vehicle. This assembly is typically located near the fuel tank pressure sensor, and you may need to remove certain components, such as the skid plate, to access it. Once you have located the assembly, you can begin the process of removing it.
Disconnect the wiring harness and any hoses connected to the evap assembly. This will involve carefully detaching any electrical connections and hoses that are attached to the assembly. It is important to label or mark these connections to ensure proper reassembly.
Locate the small clips or fasteners that secure the evap assembly in place. In some vehicles, there may be two small clips that need to be pressed together to release the assembly. Identify the specific mechanism that holds the evap assembly in your vehicle and understand how it works before proceeding.
Using the appropriate tools and techniques, carefully release the clips or fasteners. This may involve pressing, sliding, or lifting the clips, depending on their design. Be cautious not to damage the surrounding components or connections during this process.
Once the clips are released, gently pull or slide the evap assembly out of its housing. Be aware of any remaining connections or attachments that may still be holding the assembly in place. Detach these carefully to completely remove the evap assembly.
Finally, set the evap assembly aside in a safe place, away from any potential damage or interference. By following these steps, you can successfully remove the entire evap assembly from your vehicle, allowing you access to the fuel tank pressure sensor for replacement or further repairs. Remember to refer to vehicle-specific repair manuals or seek professional guidance if you encounter any challenges or uncertainties during the process.
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Disconnecting the nipple from the sensor
First, locate the fuel tank pressure sensor. It is usually found near the evap canister assembly or the fuel tank. Once you have found the sensor, you can proceed to disconnect the wiring harness and any hoses connected to it. This will help expose the nipple and sensor assembly.
Next, you will need to apply some force to disconnect the nipple from the sensor. Using a pair of pliers or a similar tool, grip the nipple firmly and pull it straight out with a gentle wiggling motion if needed. Be careful not to damage the sensor or any surrounding components. It may take some force to disconnect the nipple, but be cautious not to break or damage any parts.
If the nipple is tightly stuck, you can try using a small amount of penetrating oil or lubricant on the connection to help loosen it. Allow the oil to sit for a few minutes before attempting to disconnect the nipple again. You can also try using a pair of channel lock pliers or a nipple puller tool to get a better grip and apply more force.
In some cases, the nipple may be connected to the sensor with a clamp or a similar fastening mechanism. If this is the case, you will need to locate and loosen the clamp before attempting to disconnect the nipple. Make sure you have a firm grip on the nipple and pull it out gently but firmly.
Finally, once the nipple is disconnected, inspect the sensor for any debris or damage. It is important to ensure that the sensor is clean and free of any obstructions before installing a replacement. This will help ensure that your new sensor functions properly and does not trigger any error codes.
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Clearing the error code
The error code in your car's system can be cleared by fixing the underlying issue. In this case, the error code is likely triggered by a faulty fuel tank pressure sensor. The sensor is responsible for detecting leaks in the fuel system and alerting the ECU to trigger a "Check Engine" light if a leak is detected.
To clear the error code, you will need to replace the faulty fuel tank pressure sensor. This is not a repair that can be done by beginners and it is recommended that you leave this job to a professional repair shop. The sensor is located at the top of the fuel tank, and to gain access, the fuel tank will need to be removed from the vehicle.
Once the sensor has been replaced, the error code should be cleared, and the "Check Engine" light should turn off. If the light remains on, it is recommended that you take your car to a mechanic to have it checked out as there may be another issue causing the light to stay on.
It is important to note that simply clearing the error code without addressing the underlying issue is not a permanent solution and may lead to further complications down the line. Therefore, it is always best to diagnose and fix the root cause of the problem rather than just clearing the error code.
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Frequently asked questions
You may receive an error code or a check engine light may turn on. You can also try googling the issue or taking your car to a shop for a proper diagnosis.
The cost of replacement can be high, with some mechanics charging close to $500.
The process of replacing a fuel tank pressure sensor can vary depending on the car model. It may involve disconnecting the wiring harness and hose, removing the skid plate and evap assembly, and then installing a new sensor.
