Fuel Tank Pressure Sensor Replacement
How are fuel tank pressure sensor issues diagnosed?
When the EVAP system is checked, the purge valve and vent valve must be closed, and the pressure is monitored by the fuel pressure sensor. If that pressure drops with both valves closed, that means there's a leak in the EVAP system.
The sensor is also used in testing vent valve and purge valve operation. When the valves are open, the pressure sensor reads the fuel tank pressure and will note a drop in pressure. If it doesn't drop, the purge valve or vent valve may be faulty.
How is a fuel tank pressure sensor replaced?
If the sensor itself is faulty, the technician will remove all connectors, clean the surface around the faulty part, and install a new sensor. The EVAP system will then be allowed to run self-diagnostics to test the repair. If leaks are present or other components have failed, the test will fail.
RepairPal recommendations for fuel tank pressure sensor issues
To help prevent issues with the EVAP system, especially the charcoal canister, avoid overfilling or topping off the fuel tank.
When working with fuel, you should disconnect the battery and take proper precautions against fire hazards.
Can I replace the fuel tank pressure sensor myself?
Due to the risk of fire and the potential difficulty of diagnosis, EVAP system issues should be handled by a professional technician.
