Where is a fuel tank pressure sensor located on a Chevy?
Typically, the fuel tank pressure sensor in Chevrolet vehicles sits inside the fuel pump module mounted on top of the fuel tank, and access generally requires dropping the tank. It is not located in the engine bay.
Overview of the sensor’s typical position
In most modern Chevrolets, the fuel tank pressure (FTP) sensor is part of the EVAP system and is mounted to or integrated with the fuel pump module inside the tank. This setup allows the intake to monitor vapor pressure for leak detection and fuel vapor management. Because the sensor is inside the tank, servicing it usually involves removing the pump assembly rather than replacing a standalone sensor.
Key indicators that help you identify the sensor’s location on Chevrolet models include the following characteristics:
- Position: Attached to the top of the fuel pump module inside the fuel tank.
- Connector: A small electrical harness with 3–4 pins plugs into the sensor/module.
- Accessibility: Not normally reachable from the engine bay; underbody or rear area access is required.
In practice, this means that diagnosing FTP sensor issues often involves inspecting the pump module and its wiring, and replacement frequently involves the entire pump assembly rather than a separate sensor.
Model-specific notes
Modern Chevrolet trucks and SUVs (e.g., Silverado, Tahoe, Suburban, Equinox)
For these models, the FTP sensor is typically integrated into the fuel pump module inside the tank. Access normally requires lowering the tank, removing the pump assembly, and replacing the module if the sensor is at fault. The sensor itself is commonly not sold as a standalone part.
Chevrolet passenger cars (e.g., Malibu, Cruze, Impala, Camaro)
Many 2010s-era Chevrolet cars also place the FTP sensor in the pump module within the tank. The exact arrangement can vary by generation, but the pattern is consistent: sensor on the pump housing with a connector to the vehicle’s computer, and replacement generally involves the pump assembly.
Older or specialized models
Some older GM configurations might place a pressure sensor in different EVAP components, but for mainstream Chevrolets from the 2000s onward, the standard arrangement is the tank-mounted pump module with the sensor attached. Always verify with the service manual for your exact year and model.
How to access or replace the fuel tank pressure sensor
Because the FTP sensor is usually part of the fuel pump module inside the tank, the typical service requires removing or lowering the tank to reach the module. The following steps outline a general approach; consult your vehicle’s specific manual for precise instructions and torque specs.
Before starting any work, ensure safety by depressurizing the fuel system, disconnecting the battery, and working in a well-ventilated area with appropriate equipment. If you’re not comfortable performing fuel-system work, seek professional service.
General steps often involved:
- Relieve fuel system pressure and disconnect the negative battery terminal.
- Support the vehicle and drain or relieve fuel pressure as required by the model.
- Lower or remove the fuel tank or access panel per the vehicle’s design.
- Disconnect the electrical connector from the fuel pump module and locate the FTP sensor on the module.
- Remove the pump module to access the FTP sensor; replace the sensor or the entire module if necessary.
- Reinstall, reseal, and verify there are no leaks; test the EVAP system with a scan tool or smoke test as appropriate.
Bottom line: on most Chevy models, the fuel tank pressure sensor is integrated with the fuel pump module inside the tank, so service often means replacing the pump module rather than a separate sensor. Always use OEM parts and follow model-specific repair procedures.
Summary
For the majority of Chevrolet vehicles, the fuel tank pressure sensor resides inside the fuel pump module mounted on top of the fuel tank and is not typically accessible from the engine bay. Access generally requires dropping the tank, and replacement often involves the entire pump module. Model variations exist, so consult the specific service information for your Chevy’s year and model. If EVAP-related codes appear, verify wiring and perform appropriate diagnostics before replacing components.
