P1450
Unable to Bleed Up Fuel Tank Vacuum
Low· Fix when convenientDIY friendlyPowertrainManufacturer: Ford
What it means
On Ford vehicles the EVAP system built up vacuum during a self-test but could not release it. Usually the canister vent valve is stuck closed or blocked.
Is it safe to drive?
Safe to drive. You may have trouble refuelling (pump clicks off early).
Symptoms
- Check engine light on
- Fuel pump nozzle clicking off early
- Whoosh of air when opening the fuel cap
Probable causes
Most likely first
- 1Blocked or stuck canister vent valve (dirt, spider webs)
- 2Blocked vent filter
- 3Kinked vent line
How to diagnose it
Work through these in order before buying parts
- 1Inspect the canister vent valve and filter near the fuel tank.
- 2Command the vent valve and check it opens.
- 3Check for technical service bulletins (TSBs) or software updates for your make and model; some codes have known factory fixes.
Common fixes
- Clean or replace the canister vent valve
- Replace the vent filter
This information is general guidance for the listed makes. Exact causes, specifications and procedures vary by vehicle, so confirm with your service manual or a qualified mechanic before replacing parts.