Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001METRO L4-079 1.3L VIN 2 MFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSFUEL TANK PRESSURE SENSORDESCRIPTION AND OPERATION
2001 Chevrolet Metro L4-079 1.3L VIN 2 MFI
Fuel Tank Pressure Sensor: Description and Operation
2001 Chevrolet Metro L4-079 1.3L VIN 2 MFISECTION Description and Operation
Fuel Tank Pressure Sensor:
The fuel tank pressure sensor is located on top of the fuel tank. The fuel tank pressure sensor measures the fuel vapor pressure in the fuel tank and compares it with the barometric pressure. The fuel tank pressure sensor is similar to the manifold absolute pressure sensor. The Powertrain Control Module (PCM) supplies 5 volts and a ground to the sensor. The fuel tank pressure sensor sends a voltage signal from 0.1 to 4.9 volts back to the PCM. The output voltage of the fuel tank pressure sensor will range from 2.0 to 2.6 volts when the fuel tank filler cap is removed. The PCM uses the fuel tank pressure sensor signal as one of the inputs in order to detect EVAP control system malfunctions.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.