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P1450 on 2013-2020 Ford Fusion 1.5L: Fixes for 'Unable to Bleed Up Fuel Tank Vacuum'

On a 2013-2020 Ford Fusion with the 1.5L engine, trouble code P1450 is almost always caused by a faulty canister purge valve stuck open. This common failure leads to difficulty starting after refueling, a 'whoosh' sound from the fuel filler, and a check engine light. Replacing the purge valve assembly is the definitive fix, costing around $60-$120 for the part and is a manageable DIY repair for most owners.

22 minutes to read 2013-2020 Ford Fusion

Most Likely Cause

Stuck-Open Canister Purge Valve (CPV)

Difficulty

2/5

Est. Time

0.8 hrs

DIY Doable?

✅ Yes

Shop Labor

$140 – $320

Parts Price

$60 – $120

⚠️ Drivable, but... — You can drive, but it's not recommended for long. Continued driving can cause stalling, especially after refueling, which can be dangerous in traffic. In the long term, the excessive vacuum can deform or crack the plastic fuel tank, creating a fire hazard and potentially damaging the fuel pump assembly.

Key Takeaways

P1450 on your 1.5L Fusion almost certainly means the canister purge valve is stuck open.
The most common symptom is the engine stalling or being very difficult to start right after you get gas.
This is a known safety issue. Check if your vehicle is covered under Ford recall 18S32 before paying for repairs.
Replacing the purge valve is a DIY-friendly job that can prevent serious damage to your fuel tank.
The correct replacement part is likely an assembly with hoses, OEM part number HG9Z-9D289-F for 2017-2020 models.

The trouble code P1450 is a manufacturer-specific code for Ford that means "Unable to Bleed Up Fuel Tank Vacuum". The vehicle's main computer, the Powertrain Control Module (PCM), has detected an excessive and prolonged vacuum in the fuel tank and Evaporative Emissions (EVAP) system. Essentially, the system is being held in a state of suction because it cannot draw in fresh air to equalize pressure during its self-tests. This prevents the EVAP system from properly managing fuel vapors.

What's Unique About the 2013-2020 Ford Fusion

The second-generation Ford Fusion, particularly with EcoBoost engines like the 1.5L, is highly susceptible to this issue. The problem of a stuck-open canister purge valve causing excessive fuel tank vacuum is so well-known that Ford issued safety recall 18S32. This recall addresses the risk of the plastic fuel tank deforming or even stalling the engine due to the constant vacuum. This history, corroborated by countless owner complaints and repair videos, makes the diagnosis of P1450 on this vehicle very direct, with the purge valve being the primary suspect by a wide margin.

Symptoms You May Notice

Difficulty starting, sputtering, or stalling immediately after refueling.
Check Engine Light is on.
Engine stalling randomly while driving, sometimes at red lights.
A 'whoosh' or buzzing sound of air rushing in when opening the capless fuel filler.
Rough idle.
Car refuses to start unless the accelerator pedal is held down during cranking.

⚠️ Don't Waste Money on the Wrong Fix

Replacing the gas cap. The Ford Fusion has a capless fuel filler system, so there is no traditional cap to replace. The issue is almost always further down the EVAP system line with the purge valve itself.

Most Likely Causes

Stuck-Open Canister Purge Valve (CPV) 🔴 High Probability This is a well-documented, extremely common failure on this platform, leading to Ford issuing safety recall 18S32 (NHTSA #18V735) because a stuck-open valve can cause tank deformation and stalling. Owner complaints and forum discussions frequently cite this as the cause, with some owners replacing the part multiple times. [ODI #11415649, ODI #11511799, 22]
How to confirm: With the engine off, disconnect the vapor line from the purge valve that leads to the EVAP canister. Try to blow through the valve; if air passes through, it's stuck open and bad. Alternatively, start the engine, leave the valve's electrical connector unplugged, and feel for vacuum at the port where the hose was connected; if vacuum is present, the valve has failed.
Typical fix: Replace the canister purge valve and its associated hose assembly. This is a single unit. After replacement, clear the codes with a scanner.
Est. part cost: $60-$120

Rare But Worth Checking

Blocked EVAP Canister Vent Solenoid or Hoses: Debris, dirt, or insect nests can block the EVAP system's vent path, preventing the tank from equalizing pressure. This can mimic a bad purge valve. This is diagnosed by smoke testing the system after confirming the purge valve is good. Check the vent solenoid and hoses near the charcoal canister (rear of vehicle) for obstructions.
Faulty Fuel Tank Pressure (FTP) Sensor: While less common, the sensor that reports the fuel tank's pressure to the computer can fail, leading to an incorrect P1450 code. This is usually diagnosed after confirming the purge valve and vent paths are clear. One owner on a Car Talk forum replaced multiple EVAP parts before finding the FTP sensor was the culprit.
Loose or Damaged EVAP Hoses: A kinked, pinched, or disconnected EVAP hose can disrupt the system's ability to manage vacuum, potentially triggering the code. TSB 19-2171 for similar engines advises checking all EVAP line connections. A visual inspection of all lines connected to the purge valve assembly is a good first step.

Diagnosis Steps

Read the code with an OBD-II scanner to confirm P1450 is present. Note any other codes like P2196 or P0496.
Check for Recalls: Enter your vehicle's VIN on the NHTSA or Ford owner website to check for open recalls, specifically 18S32, which directly relates to this issue and may entitle you to a free repair.
Listen for Symptoms: Pay attention to a 'whoosh' sound from the fuel filler area after driving or a buzzing noise from the rear of the car. Note if the car is difficult to start only after refueling.
Inspect and Test the Canister Purge Valve (CPV): Locate the purge valve assembly on the top of the 1.5L engine. It is a black plastic valve with several attached hoses.
Perform the Blow-Through Test (Engine OFF): Disconnect the valve and its hoses. Try to blow air through the port that connects to the fuel tank. If any air passes through, the valve is stuck open and must be replaced.
Perform the Vacuum Test (Engine ON): Disconnect the electrical connector and the EVAP line coming from the fuel tank side. Start the engine. Place your finger over the port on the valve where the line was connected. If you feel any suction (vacuum), the valve is stuck open and must be replaced.
Inspect Vent Lines: If the purge valve tests good, trace the EVAP hoses from the engine bay to the charcoal canister (usually at the rear of the vehicle). Look for any kinks, damage, or blockages.
Clear Codes: After replacing any faulty parts, clear the diagnostic trouble codes with an OBD-II scanner and drive the vehicle to see if the light returns.

Parts You'll Likely Need

Vapor Canister Purge Valve Assembly (OEM #HG9Z-9D289-F) — This is the component that fails over 95% of the time for code P1450 on this vehicle. It gets stuck open, creating constant vacuum on the fuel tank. The part for the 1.5L engine is an assembly with multiple hoses. This part number supersedes previous versions HG9Z-9D289-A and HG9Z-9D289-C and is typically for 2017-2020 models.
Trusted brands: Motorcraft (OEM), Dorman, Standard Motor Products
OEM price range: $80-$120
Aftermarket price range: $50-$90

Related Codes That Often Appear With This One

P2196 — A stuck-open purge valve creates a vacuum leak, pulling extra un-metered fuel vapors into the engine. This can make the air-fuel mixture too rich, causing an O2 sensor to get stuck in a rich-reading state, as reported by an owner in NHTSA complaint ODI #11580810 and noted in recall documentation.
P0456 — This code for a 'very small leak' can sometimes accompany P1450. A purge valve that isn't sealing perfectly can be interpreted by the PCM as a leak under some test conditions. TSB 19-2207 for hybrid models groups these codes together as pointing to a bad purge valve.
P0496 — This code indicates 'EVAP Flow During a Non-Purge Condition,' which is another way of saying the purge valve is flowing vapor when it shouldn't be. It's a very common companion code to P1450 and points directly to a stuck-open purge valve.

Technical Service Bulletins (TSBs) & Recalls

TSB 19-2207: Applies to 2013-2017 Fusion Hybrid/Energi models with P1450, recommending a purge valve replacement and PCM update due to poor sealing of the original valve. While for a different engine, it shows a pattern of failure on the platform.
Recall 18S32 / 18V735: The most critical document for this issue, addressing the stuck-open purge valve, potential for tank deformation, and engine stalling on Fusions.

Platform-Specific Known Issues

Recall 18S32 (NHTSA #18V735): Ford issued this recall because the PCM software may not properly detect a stuck-open canister purge valve, which can lead to fuel tank deformation and potential engine stalling, increasing the risk of a crash. The remedy involves a PCM software update and, if necessary, replacing the purge valve and/or fuel tank.
Fuel Tank Deformation: As a direct result of the constant vacuum from a failed purge valve, the plastic fuel tank can be crushed or deformed. This is a serious consequence that can damage the fuel pump and lead to fuel leaks.
Repeat Failures of Aftermarket Parts: Some owners on forums report that cheaper aftermarket purge valves fail again within a year, suggesting that using the OEM Motorcraft part is a more durable long-term solution.

Mechanic-Grade Diagnostic Values

Canister Purge Valve (CPV) Solenoid Resistance — expected: 14 - 18 Ohms. Failure: Infinite resistance (open circuit) or near-zero resistance (short circuit) indicates a failed coil.
Fuel Tank Pressure (FTP) Sensor Voltage (Key On, Engine Off) — expected: ~2.4V - 2.8V at atmospheric pressure. Failure: A voltage significantly outside this range, or one that shows a vacuum (lower voltage) with the fuel filler open, suggests a biased or faulty sensor.
EVAP Canister Vent Valve Solenoid Resistance — expected: 12 - 80 Ohms. Failure: A reading outside this range indicates a faulty solenoid coil. This part is located at the rear of the vehicle near the charcoal canister.

Scan Tool Commands That Help

Ford IDS, FORScan, or other bidirectional scanner: EVAP Purge Valve Control / Purge Solenoid Command — This is the definitive test for a stuck purge valve. With the engine running, command the valve to 0% (closed). While monitoring the Fuel Tank Pressure (FTP) sensor live data, if vacuum continues to build (pressure drops), the valve is mechanically stuck open and has failed.
Ford IDS, FORScan, or other bidirectional scanner: EVAP Canister Vent Valve Command — Used to test the vent valve at the rear of the vehicle if the purge valve tests good. The vent valve is normally open. Commanding it closed should cause it to click and seal the system. If it doesn't click or seal, it may be faulty.

Wiring & Ground Locations

Canister Purge Valve (CPV) Connector — On the purge valve assembly, located on the top/front of the 1.5L engine.. This is the connection point for testing the solenoid. It receives power and a control signal from the PCM to operate the valve.
EVAP Canister Vent Valve Connector — Underneath the vehicle at the rear, connected to the EVAP charcoal canister assembly.. This connector's wiring is exposed to the elements and can corrode. Pin 2 (often a Green wire) should have battery voltage with the key on. Pin 1 (often Green/Blue) is the control ground from the PCM.
Primary Ground Point — A main ground connection point is located in the engine compartment near the fuse box, to the right of the battery.. A poor ground connection can cause erratic behavior in sensors and solenoids within the EVAP system, although it is not a common cause for P1450 specifically.

Real Owner Repair Stories

Car Talk Community user 'mamamoore2013_162939' (2015 Ford Fusion Titanium) — P1450 code, occasional negative pressure in tank with horrible noise, inconsistent hard starting after refueling.
❌ Tried (didn't work) Replaced purge valve and solenoid, Replaced spark plugs, Replaced high and low fuel pressure sensors, Checked all hoses
✅ What actually fixed it Another user reported a similar saga on their 2012 Fusion where the final culprit for P1450 was a faulty EVAP Purge Valve that was stuck open, but only after a Fuel Tank Pressure (FTP) sensor had been replaced for a prior code. The original poster acknowledged the FTP sensor was the next logical part to test.
Reddit user 'CommercialTrip8813' and commenters (2013 Ford Fusion Titanium 2.0L (symptoms/fix are identical for 1.5L)) — P1450, car won't start after getting gas unless the accelerator pedal is held down.
❌ Tried (didn't work) One user noted a cheap aftermarket purge valve failed after a month.
✅ What actually fixed it Replacing the vapor canister purge valve assembly. One user recommended buying a part from AutoZone with a lifetime warranty, as they had experienced repeat failures with cheaper online parts and kept exchanging the warrantied part for free.
YouTube channel 'DIY-IT' (Ford Fusion (post-2012)) — P1450, won't start after a full tank of gas, whining/hissing noises from the rear of the car.
❌ Tried (didn't work) First replaced the vent valve solenoid by the charcoal canister, which did not fix the problem.
✅ What actually fixed it Replacing the entire vapor canister purge valve and hose assembly in the engine bay solved the code and symptoms.

"I Checked Everything" — The Actual Cause

In cases where the purge valve and vent lines are confirmed to be good and a smoke test shows no leaks, the root cause can be a faulty Fuel Tank Pressure (FTP) sensor. A biased FTP sensor can incorrectly report a vacuum to the PCM when none exists, causing the P1450 code to set without any physical leak or blockage in the system. This was the final resolution for an owner on the Car Talk Community forums after they had already replaced the purge valve.

OEM Part Supersession History

HG9Z-9D289-A, HG9Z-9D289-C → HG9Z-9D289-F — Improved design or material to address the common sticking/leaking failure of the original valve.
Heads up: This part number is for the 2017-2020 1.5L Fusion. Earlier models (2013-2016) may use a different part number, such as AU5Z-9C915-E, which has a different physical configuration.

Model Year Variations Within This Range

2017-2020: These models typically use the canister purge valve assembly part number HG9Z-9D289-F.
2013-2016: These earlier models may use a different purge valve assembly, often cited as part number AU5Z-9C915-E. It is critical to verify the correct part for your specific model year via VIN, as the hose routing and valve configuration are different.

Diagnostic Flowchart

Start by checking for open recalls and identifying if the P1450 code is accompanied by refueling symptoms, which are hallmark signs of a failed Canister Purge Valve on this platform.

→ Stop diagnosis. Contact a Ford dealer to perform Recall 18S32. This covers a PCM update and potential replacement of the purge valve and fuel tank for free.

Does the engine stall, sputter, or struggle to start specifically after refueling at a gas station?

Locate the Canister Purge Valve (CPV) on top of the 1.5L engine. With the engine OFF, disconnect the vapor line. Can you blow air through the valve?

→ The CPV is stuck open. Replace the Canister Purge Valve and hose assembly. Use an OEM Motorcraft part to avoid the high failure rate of aftermarket units reported on this platform.

With the CPV electrical connector unplugged and the tank-side line removed, start the engine. Is there suction (vacuum) at the valve port?

→ The valve is failing under engine vacuum. Replace the CPV assembly immediately to prevent fuel tank deformation, a known risk on 2013-2020 Fusions.

Inspect the EVAP vent lines from the engine bay back to the charcoal canister. Are there any kinks, blockages, or visible damage?

→ Repair or replace the damaged EVAP lines. Ensure the lines are routed correctly to prevent future vacuum restrictions.

Inspect the plastic fuel tank for signs of being 'sucked in' or deformed. Is the tank shape distorted?

→ The CPV likely failed intermittently, creating excessive vacuum. Replace the CPV and the fuel tank/fuel pump assembly as per the safety concerns in Recall 18S32.

→ Perform a professional EVAP smoke test to check for internal blockages in the charcoal canister or a faulty fuel tank pressure sensor.