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Fuel Tank Pressure Sensors - What Are They? How Do They Work?

Fuel Tank Pressure SensorsWhat do they do?

Determine the fuel vapor pressure or vacuum within the EVAP system.

How do they work?

The sensor converts fuel tank pressure into an electrical input to the ECM, which uses the pressure readings to verify proper EVAP system operation.

Where are they located?

On top of the fuel tank or EVAP line.

Symptoms of failure

  • Check engine light


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