P1450 CEL, even after Solenoid replacement

[Galenstang]

Hey all!

I have a 2015 GT with '18 manifold, full exhaust long tube, and aftermarket intake.

I had P1450 show up about 4 months? ago, replaced purge valve, and it only came back about a week ago, which i then replaced again the next day.. As of this morning, the code has re-appeared! Driving seems unaffected, wondering if anyone has any ideas of what to diagnose next? Code is for Fuel Tank failed to Bleed Up.

Thanks so much!

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[ORRadtech]

The purge valve is not the only thing to trip that code. There's also a vent valve and canister as well as a fuel tank pressure sensor and a few hoses that could be off or damaged. Also, if the fuel filler flap doesn't seal.
I'd suggest getting a smoke test to see if it's a leak into the atmosphere or internal. The vent canister is usually somewhere near the gas tank but I haven't looked for it on the Mustang. Google could probably help with that.

 

[KingKona]

Do you over-fill your gas tank?

 

[Philgadeth]

I know it is an old post, but I am getting a P1450 due to undercoating with Krown. The fuel tank pressure sensor has a tiny hole on it to allow the sensor to read the actual ambiant pressure. The oily undercoat attracts and retains dust and ends up clogging the hole. That make the FTPS give bad readings and trips the P1450 code. I thought I'd put this here to help some other owners troubleshoot the P1450.
Ford dealer cleaned it up with brake cleaner fluid. Error went away for about a year but it just popped again. I am looking forward to try to access it myself and clean it but I still have to find an image or a video that shows exactly where the FTPS is located. To now, it remains a mistery...

 

[ice445]

I know it is an old post, but I am getting a P1450 due to undercoating with Krown. The fuel tank pressure sensor has a tiny hole on it to allow the sensor to read the actual ambiant pressure. The oily undercoat attracts and retains dust and ends up clogging the hole. That make the FTPS give bad readings and trips the P1450 code. I thought I'd put this here to help some other owners troubleshoot the P1450.
Ford dealer cleaned it up with brake cleaner fluid. Error went away for about a year but it just popped again. I am looking forward to try to access it myself and clean it but I still have to find an image or a video that shows exactly where the FTPS is located. To now, it remains a mistery...

I believe it's on top of the gas tank and kind of a PITA to get to.

 

[luca1290]

If you can jack the car up I suppose is somewhere on the EVAP canister, attached under the spare wheel well.

If you say it's for the oily undercoating, this should be a good candidate, also because the fuel tank is vented to the atmosphere though that canister.

 

[Galenstang]

I know it is an old post, but I am getting a P1450 due to undercoating with Krown. The fuel tank pressure sensor has a tiny hole on it to allow the sensor to read the actual ambiant pressure. The oily undercoat attracts and retains dust and ends up clogging the hole. That make the FTPS give bad readings and trips the P1450 code. I thought I'd put this here to help some other owners troubleshoot the P1450.
Ford dealer cleaned it up with brake cleaner fluid. Error went away for about a year but it just popped again. I am looking forward to try to access it myself and clean it but I still have to find an image or a video that shows exactly where the FTPS is located. To now, it remains a mistery...

Thanks for this suggestion! this error persists, and i came back to check on this thread... I now have jacking rails, and a low profile jack.. I'll try taking a look as I oil coat (with Krown too) once a year.

 

[Philgadeth]

Thanks for this suggestion! this error persists, and i came back to check on this thread... I now have jacking rails, and a low profile jack.. I'll try taking a look as I oil coat (with Krown too) once a year.

Over a year ago, my dealer managed to get rid of the P1450 by spraying the FTPS with brake cleaner. It took about one more year for the check engine light to come back on with the same P1450 error.
If you would like to try this solution, the FTPS is centered in front of the gas tank, towards the center of the tank and is attached to the EVAP tubing that runs across the car. It is rather hard to reach since it is located above the rear axle. I have sprayed it many times with some "air intake cleaner" as it seems it is smoother on plastics than brake cleaner. I sprayed it in three different occasions, even with the straw aimed directly à the small hole on the FTPS. Nothing would do it. The P1450 remained on.
I had to bring my Stang to my Ford Dealer who did a great job for the really uncool price of 1100$ (tx inc) CAD.
Good luck and don't hesitate to post a follow-up on here for the benefit of all users.

 

[Philgadeth]

Oh and by the way, changing the FTPS requires to lower the gas tank, which requires to remove the transmission axle, which requires to remove the subframe...so trying this at home is definitely NOT something I recommend!

 

[2morrow]

Great thread. I failed a smog test due to a permanent P1450 code. I changed the purge control valve years ago and cleared the code but I guess it’s “permanent”, which is odd.

I’m looking at other avenues and this is helpful.

Question, how can a permanent code be cleared before smog testing? TIA

 

[ORRadtech]

It's my understanding that a "permanent" OBD code is meant to prevent a simple code clear to pass emissions. Once a permanent code is set you cannot clear it by outside means. The computer must see a predetermined set of parameters being met. Those parameters can include the computer seeing several drive cycles successfully completed after the cause of the original MIL is repaired. Once that happens the permanent code will be erased by the computer.
So, if you no longer have an active MIL code, you need to find out what a "drive cycle" consists of and run it. Maybe several times, depending on what the computer expects.
I have read that it may only take 1 drive cycle after clearing with a scan tool but idk for sure.

 

[2morrow]

It's my understanding that a "permanent" OBD code is meant to prevent a simple code clear to pass emissions. Once a permanent code is set you cannot clear it by outside means. The computer must see a predetermined set of parameters being met. Those parameters can include the computer seeing several drive cycles successfully completed after the cause of the original MIL is repaired. Once that happens the permanent code will be erased by the computer.
So, if you no longer have an active MIL code, you need to find out what a "drive cycle" consists of and run it. Maybe several times, depending on what the computer expects.
I have read that it may only take 1 drive cycle after clearing with a scan tool but idk for sure.

Awesome, thank you

 

[Ramairetransam]

i had this code on my 19 gt , cost 1700 bucks at the dealer to fix . driveshaft out, rear subframe down and then gas tank down . but when i got the car back and had it on my lift nothing looked touched, so i wonder if the tech knows a way to get it down without disturbing much , the parts were replaced bc i saw the new stickers on pieces . but it makes me wonder if you have a lift and a table to hold the rear axle and subframe if you can leave the driveshaft attached and take the carrier bearing bolts out and let it pivot down and then rear in and work on it .

 

[ORRadtech]

i had this code on my 19 gt , cost 1700 bucks at the dealer to fix . driveshaft out, rear subframe down and then gas tank down . but when i got the car back and had it on my lift nothing looked touched, so i wonder if the tech knows a way to get it down without disturbing much , the parts were replaced bc i saw the new stickers on pieces . but it makes me wonder if you have a lift and a table to hold the rear axle and subframe if you can leave the driveshaft attached and take the carrier bearing bolts out and let it pivot down and then rear in and work on it .

I don't remember where I saw it but I recall reading where someone was able to loosen stuff up to create enough room to get a hand in there. I recall it being a huge pita having to work by feel. But I can absolutely see a tech knowing a shortcut to beat book time.

 

[2morrow]

@ORRadtech , I cleared the code by swapping out some evap lines, purge valve and doing the Ford drive cycle, however 2 monsters still haven’t come online. Both the 02 sensor and 02 heater monitors.

It’s the 2 on the bottom row of the upper left icons. (They flash).

As soon as I get those monitors to come back online it’s pass smog

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