DTC P1450: Unable To Bleed Up Fuel Tank Vacuum

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

P1450 - UNABLE TO BLEED UP FUEL TANK VACUUM

Description:	Monitors the fuel vapor vacuum and pressure in the fuel tank. System failure occurs when the evaporative emission (EVAP) running loss monitor detects excessive fuel tank vacuum with the engine running, but not at idle.
Possible Causes:	Blockages or kinks in the EVAP canister tube or EVAP canister purge outlet tube between the fuel tank, the EVAP canister purge valve and the EVAP canister Capless fuel tank filler pipe damaged, preventing vacuum relief Contaminated fuel vapor elbow on the EVAP canister Restricted EVAP canister Canister vent (CV) solenoid stuck partially or fully open Plugged CV solenoid filter EVAP canister purge valve stuck open VREF circuit open in the harness near the fuel tank pressure (FTP) sensor, the FTP sensor or the powertrain control module (PCM) Damaged FTP sensor
Diagnostic Aids:	Visually inspect the EVAP canister inlet port, CV solenoid filter, and canister vent hose assembly for contamination or debris.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST HX .