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 MANUALSSATURN2002SL1 L4-1.9L SOHC VIN 8REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSFUEL TANK PRESSURE SENSORDESCRIPTION AND OPERATION
2002 Saturn SL1 L4-1.9L SOHC VIN 8
Fuel Tank Pressure Sensor: Description and Operation
2002 Saturn SL1 L4-1.9L SOHC VIN 8SECTION Description and Operation
FUEL TANK PRESSURE SENSOR
The fuel tank pressure sensor is located on top of the fuel tank. The function of the fuel tank pressure sensor is solely for EVAP leak diagnostics. The fuel tank pressure sensor is a transducer that varies resistance according to changes in fuel tank pressure. The fuel tank pressure sensor works inverse to a MAP sensor. The PCM measures the signal voltage from the fuel tank pressure sensor, which is a reduced value of the PCM 5 volt reference. The signal voltage reads high when the pressure in the fuel tank is low (vacuum) and decreases as the pressure in the tank increases.
The fuel tank pressure sensor is located on top of the fuel tank. The function of the fuel tank pressure sensor is solely for EVAP leak diagnostics. The fuel tank pressure sensor is a transducer that varies resistance according to changes in fuel tank pressure. The fuel tank pressure sensor works inverse to a MAP sensor. The PCM measures the signal voltage from the fuel tank pressure sensor, which is a reduced value of the PCM 5 volt reference. The signal voltage reads high when the pressure in the fuel tank is low (vacuum) and decreases as the pressure in the tank increases.
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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.