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 MANUALSPONTIAC1998FIREBIRD V8-5.7L VIN GREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSFUEL TANK PRESSURE SENSORDESCRIPTION AND OPERATION
1998 Pontiac Firebird V8-5.7L VIN G
Fuel Tank Pressure Sensor: Description and Operation
1998 Pontiac Firebird V8-5.7L VIN GSECTION Description and Operation
DESCRIPTION
The Fuel Tank Pressure sensor is a sensor much like that of the common MAP sensor. The Fuel Tank Pressure sensor measures the difference between the outside air pressure and the air pressure (or vacuum) in the fuel tank.
The Fuel Tank Pressure sensor mounts to the fuel tank sending unit. A three wire electrical harness connects the sensor to the PCM. The PCM supplies a 5.0 volt reference voltage and a ground to the sensor. The sensor will return a voltage between 0.1 and 4.9 volts on the signal circuit.
RENDER: 1.0x
NO RELATED
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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.