FUEL TANK PRESSURE SENSOR PERFORMANCE

The fuel tank pressure sensor measures how much pressure is in the fuel tank. If it sees values that are outside the normal range, it sets a fault code to alert the system.

The computer expects the fuel tank pressure to be between -2 to +8 inches of water vacuum. When the reading is significantly outside this range (either too high or too low), it triggers the fault.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Inspect the fuel tank pressure sensor wiring and connectors for damage or corrosion. If found, repair or replace as needed. Decision point: If repairs are made, clear code and test drive. Does the code return?
2. 22. Check the fuel cap for proper seating and any damage. Ensure it is tightened. Decision point: If the cap was loose or damaged, replace it and retest. Does the code return?
3. 33. Measure fuel tank pressure using a scan tool or pressure gauge. Compare against expected values (-2 to +8 in water vacuum). Decision point: If the sensor reads correctly, the issue may be with the ECM; otherwise, replace the fuel tank pressure sensor.

• Failed fuel tank pressure sensor
• Wiring issues or bad connectors
• Blocked or damaged evaporative emissions lines
• Loose or damaged fuel cap

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