The evap fuel tank pressure sensor is typically found on or near the fuel tank or on the evaporative canister. Exact placement varies by make and model, so checking your vehicle’s service information is the most reliable method.
Understanding the FTP Sensor
The Fuel Tank Pressure (FTP) sensor monitors pressure inside the evaporative (EVAP) system. It helps the engine control unit detect leaks, verify proper vapor purge operation, and support emissions compliance. In many cars, this sensor is part of the EVAP hardware that the onboard diagnostics (OBD-II) uses to monitor system integrity.
Common locations by vehicle design
These are typical places you’ll find the FTP sensor on many cars. Depending on make, it may be integrated into the fuel pump module or mounted on the evaporative canister.
- On the fuel tank or inside the fuel pump module: Many modern vehicles place the FTP sensor in the tank assembly, above or near the fuel pump, with an electrical connector and a small vacuum line.
- On the EVAP canister housing in the engine bay: Some vehicles mount the sensor directly on or near the charcoal canister, which sits in the engine bay or toward the rear of the engine compartment.
- Near the purge valve or intake manifold: In certain designs the FTP sensor sits close to the purge valve assembly, sharing hoses to sense tank pressure.
- In the rear trunk or under-car area (where the canister is located): A few models place the sensor at the EVAP canister location in the rear half of the vehicle, behind panels or under trim.
Remember, the exact spot can vary widely by model and year. If you’re unsure, consult the factory service manual or a reputable parts diagram for your vehicle, searching for “fuel tank pressure sensor” or “FTPS.”
How to locate it on your vehicle: a practical guide
The following steps help you identify the FTP sensor on most cars. Start with model-specific references since layouts vary widely.
- Find the EVAP system components: locate the EVAP canister (charcoal canister) and the purge valve in the engine bay, or locate the tank in the trunk or under the rear seat depending on the model.
- Follow vacuum hoses from the purge valve toward the tank; the sensor is typically attached along this path or at the canister housing.
- Look for a small plastic sensor with a 3- or 4-pin electrical connector and a short vacuum hose to the system.
- Check the fuel pump module in the tank if you cannot find a separate sensor in the engine bay; the FTP sensor may be integrated there.
If you still cannot locate the sensor, refer to the vehicle’s service information system (SIS) or OEM diagrams, or ask a mechanic with model-specific guidance.
Summary
In most vehicles, the evap fuel tank pressure sensor is located on or near the fuel tank or EVAP canister, with placement varying by make and model. Use the service manual or diagrams for your exact year and model to confirm the precise location, and inspect for a small sensor with an electrical connector and possible vacuum hose. This knowledge helps with diagnostics, replacement, and emissions-related maintenance.